Match html canvas which is transferred to OffscreenCanvas to CSS style

third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 36 matching lines @@
 #include "core/html/HTMLSelectElement.h"
 #include "core/html/ImageData.h"
 #include "core/html/canvas/CanvasAsyncBlobCreator.h"
 #include "core/html/canvas/CanvasContextCreationAttributes.h"
 #include "core/html/canvas/CanvasFontCache.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
 #include "core/html/canvas/CanvasRenderingContextFactory.h"
 #include "core/imagebitmap/ImageBitmapOptions.h"
 #include "core/layout/HitTestCanvasResult.h"
 #include "core/layout/LayoutHTMLCanvas.h"
+#include "core/layout/api/LayoutViewItem.h"
+#include "core/layout/compositing/PaintLayerCompositor.h"
 #include "core/paint/PaintLayer.h"
 #include "core/paint/PaintTiming.h"
 #include "platform/Histogram.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/Canvas2DImageBufferSurface.h"
 #include "platform/graphics/CanvasMetrics.h"
 #include "platform/graphics/ExpensiveCanvasHeuristicParameters.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/RecordingImageBufferSurface.h"
 #include "platform/graphics/StaticBitmapImage.h"
@@ skipping 1330 matching lines @@
   return String();
 }
 
 bool HTMLCanvasElement::createSurfaceLayer() {
   DCHECK(!m_surfaceLayerBridge);
   mojom::blink::OffscreenCanvasSurfacePtr service;
   Platform::current()->interfaceProvider()->getInterface(
       mojo::GetProxy(&service));
   m_surfaceLayerBridge =
       WTF::wrapUnique(new CanvasSurfaceLayerBridge(std::move(service)));
-  return m_surfaceLayerBridge->createSurfaceLayer(this->width(),
-                                                  this->height());
+  bool result =
+      m_surfaceLayerBridge->createSurfaceLayer(this->width(), this->height());
+  // After creating a new WebLayer, we want to force compositor commit
+  // to repaint.
+  document().layoutViewItem().compositor()->setNeedsCompositingUpdate(
+      CompositingUpdateRebuildTree);
+  return result;
 }
 
 }  // namespace blink