Synchronize OffscreenCanvas content with the placeholder canvas

third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModuleTest.cpp

 // Copyright 2016 The Chromium 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 "modules/canvas/HTMLCanvasElementModule.h"
 
 #include "core/dom/DOMNodeIds.h"
 #include "core/dom/Document.h"
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLCanvasElement.h"
@@ skipping 31 matching lines @@
   // This unit test only tests if the Canvas Id is associated correctly, so we
   // exclude the part that creates surface layer bridge because a mojo message
   // pipe cannot be tested using webkit unit tests.
   return HTMLCanvasElementModule::transferControlToOffscreenInternal(
       canvasElement(), exceptionState);
 }
 
 TEST_F(HTMLCanvasElementModuleTest, TransferControlToOffscreen) {
   NonThrowableExceptionState exceptionState;
   OffscreenCanvas* offscreenCanvas = transferControlToOffscreen(exceptionState);
-  int canvasId = offscreenCanvas->getAssociatedCanvasId();
+  int canvasId = offscreenCanvas->placeholderCanvasId();
   EXPECT_EQ(canvasId, DOMNodeIds::idForNode(&(canvasElement())));
 }
 
 }  // namespace blink