Unbreak internal rolls (flutter#9270)

Adds back constructor for Rasterizer temporarily

Author: dnfield

shell/common/rasterizer.cc

@@ -22,6 +22,15 @@ namespace flutter {
 // used within this interval.
 static constexpr std::chrono::milliseconds kSkiaCleanupExpiration(15000);
 
+// TODO(dnfield): Remove this once internal embedders have caught up.
+static Rasterizer::DummyDelegate dummy_delegate_;
+Rasterizer::Rasterizer(
+    TaskRunners task_runners,
+    std::unique_ptr<flutter::CompositorContext> compositor_context)
+    : Rasterizer(dummy_delegate_,
+                 std::move(task_runners),
+                 std::move(compositor_context)) {}
+
 Rasterizer::Rasterizer(Delegate& delegate, TaskRunners task_runners)
     : Rasterizer(delegate,
                  std::move(task_runners),

shell/common/rasterizer.h

@@ -26,6 +26,13 @@ class Rasterizer final : public SnapshotDelegate {
    public:
     virtual void OnFrameRasterized(const FrameTiming&) = 0;
   };
+  // TODO(dnfield): remove once embedders have caught up.
+  class DummyDelegate : public Delegate {
+    void OnFrameRasterized(const FrameTiming&) override {}
+  };
+  Rasterizer(TaskRunners task_runners,
+             std::unique_ptr<flutter::CompositorContext> compositor_context);
+
   Rasterizer(Delegate& delegate, TaskRunners task_runners);
 
   Rasterizer(Delegate& delegate,