Use a union typdef for the return type of canvas.getContext

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

Index: third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModule.cpp
diff --git a/third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModule.cpp b/third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModule.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..09f992f2cf01f9b7b3e18e551a876c3e9d171f26
--- /dev/null
+++ b/third_party/WebKit/Source/modules/canvas/HTMLCanvasElementModule.cpp
@@ -0,0 +1,20 @@
+// 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/html/canvas/CanvasContextCreationAttributes.h"
+#include "core/html/canvas/CanvasRenderingContext.h"
+
+namespace blink {
+
+void HTMLCanvasElementModule::getContext(HTMLCanvasElement& canvas, const String& type, const CanvasContextCreationAttributes& attributes, RenderingContext& result)
+{
+    CanvasRenderingContext* context = canvas.getCanvasRenderingContext(type, attributes);
+    if (context) {
+        context->setCanvasGetContextResult(result);
+    }
+}
+
+}