[Impeller] Create an autorelease pool for Impeller tests running on macOS.

ci/licenses_golden/licenses_flutter

@@ -928,6 +928,8 @@ ORIGIN: ../../../flutter/fml/platform/darwin/platform_version.h + ../../../flutt
 ORIGIN: ../../../flutter/fml/platform/darwin/platform_version.mm + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/fml/platform/darwin/scoped_block.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/fml/platform/darwin/scoped_block.mm + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/fml/platform/darwin/scoped_nsautorelease_pool.cc + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/fml/platform/darwin/scoped_nsautorelease_pool.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/fml/platform/darwin/scoped_nsobject.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/fml/platform/darwin/scoped_nsobject.mm + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/fml/platform/darwin/string_range_sanitization.h + ../../../flutter/LICENSE
@@ -3569,6 +3571,8 @@ FILE: ../../../flutter/fml/platform/darwin/platform_version.h
 FILE: ../../../flutter/fml/platform/darwin/platform_version.mm
 FILE: ../../../flutter/fml/platform/darwin/scoped_block.h
 FILE: ../../../flutter/fml/platform/darwin/scoped_block.mm
+FILE: ../../../flutter/fml/platform/darwin/scoped_nsautorelease_pool.cc
+FILE: ../../../flutter/fml/platform/darwin/scoped_nsautorelease_pool.h
 FILE: ../../../flutter/fml/platform/darwin/scoped_nsobject.h
 FILE: ../../../flutter/fml/platform/darwin/scoped_nsobject.mm
 FILE: ../../../flutter/fml/platform/darwin/string_range_sanitization.h

fml/BUILD.gn

@@ -150,6 +150,8 @@ source_set("fml") {
       "platform/darwin/platform_version.mm",
       "platform/darwin/scoped_block.h",
       "platform/darwin/scoped_block.mm",
+      "platform/darwin/scoped_nsautorelease_pool.cc",
+      "platform/darwin/scoped_nsautorelease_pool.h",
       "platform/darwin/scoped_nsobject.h",
       "platform/darwin/scoped_nsobject.mm",
       "platform/darwin/string_range_sanitization.h",

fml/platform/darwin/scoped_nsautorelease_pool.cc

@@ -0,0 +1,26 @@
+// 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.
+
+#include "flutter/fml/platform/darwin/scoped_nsautorelease_pool.h"
+
+#include <objc/message.h>
+#include <objc/runtime.h>
+
+namespace {
+typedef id (*msg_send)(void*, SEL);
+}  // anonymous namespace
+
+namespace fml {
+
+ScopedNSAutoreleasePool::ScopedNSAutoreleasePool() {
+  autorelease_pool_ = reinterpret_cast<msg_send>(objc_msgSend)(
+      objc_getClass("NSAutoreleasePool"), sel_getUid("new"));
+}
+
+ScopedNSAutoreleasePool::~ScopedNSAutoreleasePool() {
+  reinterpret_cast<msg_send>(objc_msgSend)(autorelease_pool_,
+                                           sel_getUid("drain"));
+}
+
+}  // namespace fml

fml/platform/darwin/scoped_nsautorelease_pool.h

@@ -0,0 +1,26 @@
+// 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.
+
+#ifndef FLUTTER_FML_PLATFORM_DARWIN_SCOPED_NSAUTORELEASEPOOL_H_
+#define FLUTTER_FML_PLATFORM_DARWIN_SCOPED_NSAUTORELEASEPOOL_H_
+
+#include "flutter/fml/macros.h"
+
+namespace fml {
+
+// Pushes an autorelease pool when constructed and pops it when destructed.
+class ScopedNSAutoreleasePool {
+ public:
+  ScopedNSAutoreleasePool();
+  ~ScopedNSAutoreleasePool();
+
+ private:
+  void* autorelease_pool_;
+
+  FML_DISALLOW_COPY_AND_ASSIGN(ScopedNSAutoreleasePool);
+};
+
+}  // namespace fml
+
+#endif  // FLUTTER_FML_PLATFORM_DARWIN_SCOPED_NSAUTORELEASEPOOL_H_

impeller/golden_tests/golden_playground_test.h

@@ -12,6 +12,10 @@
 #include "flutter/impeller/renderer/render_target.h"
 #include "flutter/testing/testing.h"
 
+#if FML_OS_MACOSX
+#include "flutter/fml/platform/darwin/scoped_nsautorelease_pool.h"
+#endif
+
 namespace impeller {
 
 class GoldenPlaygroundTest
@@ -51,6 +55,11 @@ class GoldenPlaygroundTest
   struct GoldenPlaygroundTestImpl;
   // This is only a shared_ptr so it can work with a forward declared type.
   std::shared_ptr<GoldenPlaygroundTestImpl> pimpl_;
+
+#if FML_OS_MACOSX
+  fml::ScopedNSAutoreleasePool autorelease_pool_;
+#endif
+
   FML_DISALLOW_COPY_AND_ASSIGN(GoldenPlaygroundTest);
 };
 

impeller/playground/playground.cc

@@ -31,8 +31,7 @@
 #include "third_party/imgui/imgui.h"
 
 #if FML_OS_MACOSX
-#include <objc/message.h>
-#include <objc/runtime.h>
+#include "fml/platform/darwin/scoped_nsautorelease_pool.h"
 #endif
 
 namespace impeller {
@@ -183,23 +182,6 @@ void Playground::SetCursorPosition(Point pos) {
   cursor_position_ = pos;
 }
 
-#if FML_OS_MACOSX
-class AutoReleasePool {
- public:
-  AutoReleasePool() {
-    pool_ = reinterpret_cast<msg_send>(objc_msgSend)(
-        objc_getClass("NSAutoreleasePool"), sel_getUid("new"));
-  }
-  ~AutoReleasePool() {
-    reinterpret_cast<msg_send>(objc_msgSend)(pool_, sel_getUid("drain"));
-  }
-
- private:
-  typedef id (*msg_send)(void*, SEL);
-  id pool_;
-};
-#endif
-
 bool Playground::OpenPlaygroundHere(
     const Renderer::RenderCallback& render_callback) {
   if (!switches_.enable_playground) {
@@ -262,7 +244,7 @@ bool Playground::OpenPlaygroundHere(
 
   while (true) {
 #if FML_OS_MACOSX
-    AutoReleasePool pool;
+    fml::ScopedNSAutoreleasePool pool;
 #endif
     ::glfwPollEvents();
 

impeller/playground/playground_test.h

@@ -13,6 +13,10 @@
 #include "impeller/playground/playground.h"
 #include "impeller/playground/switches.h"
 
+#if FML_OS_MACOSX
+#include "flutter/fml/platform/darwin/scoped_nsautorelease_pool.h"
+#endif
+
 namespace impeller {
 
 class PlaygroundTest : public Playground,
@@ -42,6 +46,10 @@ class PlaygroundTest : public Playground,
   // |Playground|
   bool ShouldKeepRendering() const;
 
+#if FML_OS_MACOSX
+  fml::ScopedNSAutoreleasePool autorelease_pool_;
+#endif
+
   FML_DISALLOW_COPY_AND_ASSIGN(PlaygroundTest);
 };