getImageData now finalizesFrame and disableAcceleration updates composit

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h

Index: third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h
diff --git a/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h b/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h
index 4c22eca8bb8c666bc763048fbabe6e7abe0a25cc..440d987c2a52d4005ae63923da744ad6abec61be 100644
--- a/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h
+++ b/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h
@@ -98,6 +98,10 @@ class MODULES_EXPORT OffscreenCanvasRenderingContext2D final
       const CanvasContextCreationAttributes& attrs);
   DECLARE_VIRTUAL_TRACE();
 
+  virtual void NeedsFinalizeFrame() {
+    CanvasRenderingContext::NeedsFinalizeFrame();
+  }
+
  private:
   bool needs_matrix_clip_restore_ = false;
   std::unique_ptr<ImageBuffer> image_buffer_;