diff --git a/.cirrus.yml b/.cirrus.yml
index 2d17926ed4923..052d88dbb219f 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -83,7 +83,7 @@ task:
       fetch_framework_script: |
         mkdir -p $FRAMEWORK_PATH
         cd $FRAMEWORK_PATH
-        git clone https://github.com/flutter/flutter.git
+        git clone -b 'flutter-1.20-candidate.7' https://github.com/flutter/flutter.git
       test_web_script: |
         cd $FRAMEWORK_PATH/flutter/dev/integration_tests/web
         ../../../bin/flutter config --local-engine=host_debug_unopt --no-analytics --enable-web
diff --git a/ci/licenses_golden/licenses_flutter b/ci/licenses_golden/licenses_flutter
index 60751e774da1a..bf97ba8ead1d6 100755
--- a/ci/licenses_golden/licenses_flutter
+++ b/ci/licenses_golden/licenses_flutter
@@ -908,6 +908,7 @@ FILE: ../../../flutter/shell/platform/darwin/ios/framework/Source/FlutterOverlay
 FILE: ../../../flutter/shell/platform/darwin/ios/framework/Source/FlutterPlatformPlugin.h
 FILE: ../../../flutter/shell/platform/darwin/ios/framework/Source/FlutterPlatformPlugin.mm
 FILE: ../../../flutter/shell/platform/darwin/ios/framework/Source/FlutterPlatformViews.mm
+FILE: ../../../flutter/shell/platform/darwin/ios/framework/Source/FlutterPlatformViewsTest.mm
 FILE: ../../../flutter/shell/platform/darwin/ios/framework/Source/FlutterPlatformViews_Internal.h
 FILE: ../../../flutter/shell/platform/darwin/ios/framework/Source/FlutterPlatformViews_Internal.mm
 FILE: ../../../flutter/shell/platform/darwin/ios/framework/Source/FlutterPluginAppLifeCycleDelegate.mm
diff --git a/lib/web_ui/dev/web_engine_analysis.sh b/lib/web_ui/dev/web_engine_analysis.sh
new file mode 100755
index 0000000000000..1ea919f499d18
--- /dev/null
+++ b/lib/web_ui/dev/web_engine_analysis.sh
@@ -0,0 +1,20 @@
+#!/bin/bash
+set -e
+set -x
+
+# web_analysis: a command-line utility for running dart analyzer on Flutter Web
+# Engine. Used/Called by LUCI recipes:
+#
+# See: https://flutter.googlesource.com/recipes/+/refs/heads/master/recipes/web_engine.py
+
+echo "Engine path $ENGINE_PATH"
+
+DART_SDK_DIR="${ENGINE_PATH}/src/out/host_debug_unopt/dart-sdk"
+PUB_PATH="$DART_SDK_DIR/bin/pub"
+DART_ANALYZER_PATH="$DART_SDK_DIR/bin/dartanalyzer"
+
+echo "Running \`pub get\` in 'engine/src/flutter/lib/web_ui'"
+(cd "$WEB_UI_DIR"; $PUB_PATH get)
+
+echo "Running \`dartanalyzer\` in 'engine/src/flutter/lib/web_ui'"
+(cd "$WEB_UI_DIR"; $DART_ANALYZER_PATH --enable-experiment=non-nullable --fatal-warnings --fatal-hints dev/ lib/ test/ tool/)
diff --git a/shell/platform/darwin/ios/BUILD.gn b/shell/platform/darwin/ios/BUILD.gn
index e8d1c67beed90..67daeedcbc77f 100644
--- a/shell/platform/darwin/ios/BUILD.gn
+++ b/shell/platform/darwin/ios/BUILD.gn
@@ -167,6 +167,7 @@ source_set("ios_test_flutter_mrc") {
     "-mios-simulator-version-min=$ios_testing_deployment_target",
   ]
   sources = [
+    "framework/Source/FlutterPlatformViewsTest.mm",
     "framework/Source/accessibility_bridge_test.mm",
   ]
   deps = [
diff --git a/shell/platform/darwin/ios/framework/Source/FlutterPlatformViews.mm b/shell/platform/darwin/ios/framework/Source/FlutterPlatformViews.mm
index 1b021bc60818d..abf854f15731b 100644
--- a/shell/platform/darwin/ios/framework/Source/FlutterPlatformViews.mm
+++ b/shell/platform/darwin/ios/framework/Source/FlutterPlatformViews.mm
@@ -122,15 +122,6 @@
 }
 
 void FlutterPlatformViewsController::OnCreate(FlutterMethodCall* call, FlutterResult& result) {
-  if (!flutter_view_.get()) {
-    // Right now we assume we have a reference to FlutterView when creating a new view.
-    // TODO(amirh): support this by setting the reference to FlutterView when it becomes available.
-    // https://github.com/flutter/flutter/issues/23787
-    result([FlutterError errorWithCode:@"create_failed"
-                               message:@"can't create a view on a headless engine"
-                               details:nil]);
-    return;
-  }
   NSDictionary<NSString*, id>* args = [call arguments];
 
   long viewId = [args[@"id"] longValue];
@@ -407,6 +398,7 @@
 
 void FlutterPlatformViewsController::CompositeWithParams(int view_id,
                                                          const EmbeddedViewParams& params) {
+  FML_DCHECK(flutter_view_);
   CGRect frame = CGRectMake(0, 0, params.sizePoints().width(), params.sizePoints().height());
   UIView* touchInterceptor = touch_interceptors_[view_id].get();
   touchInterceptor.layer.transform = CATransform3DIdentity;
@@ -429,6 +421,7 @@
 }
 
 SkCanvas* FlutterPlatformViewsController::CompositeEmbeddedView(int view_id) {
+  FML_DCHECK(flutter_view_);
   // TODO(amirh): assert that this is running on the platform thread once we support the iOS
   // embedded views thread configuration.
 
@@ -472,6 +465,7 @@
 bool FlutterPlatformViewsController::SubmitFrame(GrContext* gr_context,
                                                  std::shared_ptr<IOSContext> ios_context,
                                                  std::unique_ptr<SurfaceFrame> frame) {
+  FML_DCHECK(flutter_view_);
   if (merge_threads_) {
     // Threads are about to be merged, we drop everything from this frame
     // and possibly resubmit the same layer tree in the next frame.
@@ -578,6 +572,7 @@
 }
 
 void FlutterPlatformViewsController::BringLayersIntoView(LayersMap layer_map) {
+  FML_DCHECK(flutter_view_);
   UIView* flutter_view = flutter_view_.get();
   auto zIndex = 0;
   // Clear the `active_composition_order_`, which will be populated down below.
@@ -619,6 +614,7 @@
     SkRect rect,
     int64_t view_id,
     int64_t overlay_id) {
+  FML_DCHECK(flutter_view_);
   std::shared_ptr<FlutterPlatformViewLayer> layer = layer_pool_->GetLayer(gr_context, ios_context);
 
   UIView* overlay_view_wrapper = layer->overlay_view_wrapper.get();
diff --git a/shell/platform/darwin/ios/framework/Source/FlutterPlatformViewsTest.mm b/shell/platform/darwin/ios/framework/Source/FlutterPlatformViewsTest.mm
new file mode 100644
index 0000000000000..e2a0088dfc96b
--- /dev/null
+++ b/shell/platform/darwin/ios/framework/Source/FlutterPlatformViewsTest.mm
@@ -0,0 +1,146 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <XCTest/XCTest.h>
+
+#import "flutter/shell/platform/darwin/common/framework/Headers/FlutterBinaryMessenger.h"
+#import "flutter/shell/platform/darwin/common/framework/Headers/FlutterMacros.h"
+#import "flutter/shell/platform/darwin/ios/framework/Headers/FlutterPlatformViews.h"
+#import "flutter/shell/platform/darwin/ios/framework/Source/FlutterPlatformViews_Internal.h"
+#import "flutter/shell/platform/darwin/ios/platform_view_ios.h"
+#import "third_party/ocmock/Source/OCMock/OCMock.h"
+
+FLUTTER_ASSERT_NOT_ARC
+@class FlutterPlatformViewsTestMockPlatformView;
+static FlutterPlatformViewsTestMockPlatformView* gMockPlatformView = nil;
+
+@interface FlutterPlatformViewsTestMockPlatformView : UIView
+@end
+@implementation FlutterPlatformViewsTestMockPlatformView
+
+- (instancetype)init {
+  self = [super init];
+  if (self) {
+    gMockPlatformView = self;
+  }
+  return self;
+}
+
+- (void)dealloc {
+  gMockPlatformView = nil;
+  [super dealloc];
+}
+
+@end
+
+@interface FlutterPlatformViewsTestMockFlutterPlatformView : NSObject <FlutterPlatformView>
+@property(nonatomic, strong) UIView* view;
+@end
+
+@implementation FlutterPlatformViewsTestMockFlutterPlatformView
+
+- (instancetype)init {
+  if (self = [super init]) {
+    _view = [[FlutterPlatformViewsTestMockPlatformView alloc] init];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  [_view release];
+  _view = nil;
+  [super dealloc];
+}
+
+@end
+
+@interface FlutterPlatformViewsTestMockFlutterPlatformFactory
+    : NSObject <FlutterPlatformViewFactory>
+@end
+
+@implementation FlutterPlatformViewsTestMockFlutterPlatformFactory
+- (NSObject<FlutterPlatformView>*)createWithFrame:(CGRect)frame
+                                   viewIdentifier:(int64_t)viewId
+                                        arguments:(id _Nullable)args {
+  return [[[FlutterPlatformViewsTestMockFlutterPlatformView alloc] init] autorelease];
+}
+
+@end
+
+namespace flutter {
+namespace {
+class FlutterPlatformViewsTestMockPlatformViewDelegate : public PlatformView::Delegate {
+  void OnPlatformViewCreated(std::unique_ptr<Surface> surface) override {}
+  void OnPlatformViewDestroyed() override {}
+  void OnPlatformViewSetNextFrameCallback(const fml::closure& closure) override {}
+  void OnPlatformViewSetViewportMetrics(const ViewportMetrics& metrics) override {}
+  void OnPlatformViewDispatchPlatformMessage(fml::RefPtr<PlatformMessage> message) override {}
+  void OnPlatformViewDispatchPointerDataPacket(std::unique_ptr<PointerDataPacket> packet) override {
+  }
+  void OnPlatformViewDispatchSemanticsAction(int32_t id,
+                                             SemanticsAction action,
+                                             std::vector<uint8_t> args) override {}
+  void OnPlatformViewSetSemanticsEnabled(bool enabled) override {}
+  void OnPlatformViewSetAccessibilityFeatures(int32_t flags) override {}
+  void OnPlatformViewRegisterTexture(std::shared_ptr<Texture> texture) override {}
+  void OnPlatformViewUnregisterTexture(int64_t texture_id) override {}
+  void OnPlatformViewMarkTextureFrameAvailable(int64_t texture_id) override {}
+
+  std::unique_ptr<std::vector<std::string>> ComputePlatformViewResolvedLocale(
+      const std::vector<std::string>& supported_locale_data) override {
+    std::unique_ptr<std::vector<std::string>> out = std::make_unique<std::vector<std::string>>();
+    return out;
+  }
+};
+
+}  // namespace
+}  // namespace flutter
+
+namespace {
+fml::RefPtr<fml::TaskRunner> CreateNewThread(std::string name) {
+  auto thread = std::make_unique<fml::Thread>(name);
+  auto runner = thread->GetTaskRunner();
+  return runner;
+}
+}  // namespace
+
+@interface FlutterPlatformViewsTest : XCTestCase
+@end
+
+@implementation FlutterPlatformViewsTest
+
+- (void)testCanCreatePlatformViewWithoutFlutterView {
+  flutter::FlutterPlatformViewsTestMockPlatformViewDelegate mock_delegate;
+  auto thread_task_runner = CreateNewThread("FlutterPlatformViewsTest");
+  flutter::TaskRunners runners(/*label=*/self.name.UTF8String,
+                               /*platform=*/thread_task_runner,
+                               /*raster=*/thread_task_runner,
+                               /*ui=*/thread_task_runner,
+                               /*io=*/thread_task_runner);
+  auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
+      /*delegate=*/mock_delegate,
+      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*task_runners=*/runners);
+
+  auto flutterPlatformViewsController = std::make_unique<flutter::FlutterPlatformViewsController>();
+
+  FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
+      [[FlutterPlatformViewsTestMockFlutterPlatformFactory new] autorelease];
+  flutterPlatformViewsController->RegisterViewFactory(
+      factory, @"MockFlutterPlatformView",
+      FlutterPlatformViewGestureRecognizersBlockingPolicyEager);
+  FlutterResult result = ^(id result) {
+  };
+  flutterPlatformViewsController->OnMethodCall(
+      [FlutterMethodCall
+          methodCallWithMethodName:@"create"
+                         arguments:@{@"id" : @2, @"viewType" : @"MockFlutterPlatformView"}],
+      result);
+
+  XCTAssertNotNil(gMockPlatformView);
+
+  flutterPlatformViewsController->Reset();
+}
+
+@end