Match html canvas which is transferred to OffscreenCanvas to CSS style

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

Index: third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
index 9fd7e8d3d938529fff7db558d1ea3227f7c1d8e2..04a34a22edbbf485ad87a93d4e5313ce146428a2 100644
--- a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
@@ -54,6 +54,8 @@
 #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"
@@ -1370,8 +1372,14 @@ bool HTMLCanvasElement::createSurfaceLayer() {
       mojo::GetProxy(&service));
   m_surfaceLayerBridge =
       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