Move WebGraphicsContext3D::Attributes to Platform::ContextAttributes.

third_party/WebKit/Source/modules/webgl/WebGLContextAttributeHelpers.cpp

 // Copyright 2014 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/webgl/WebGLContextAttributeHelpers.h"
 
 #include "core/frame/Settings.h"
 
 namespace blink {
 
 WebGLContextAttributes toWebGLContextAttributes(const CanvasContextCreationAttributes& attrs)
 {
     WebGLContextAttributes result;
     result.setAlpha(attrs.alpha());
     result.setDepth(attrs.depth());
     result.setStencil(attrs.stencil());
     result.setAntialias(attrs.antialias());
     result.setPremultipliedAlpha(attrs.premultipliedAlpha());
     result.setPreserveDrawingBuffer(attrs.preserveDrawingBuffer());
     result.setFailIfMajorPerformanceCaveat(attrs.failIfMajorPerformanceCaveat());
     return result;
 }
 
-WebGraphicsContext3D::Attributes toWebGraphicsContext3DAttributes(const WebGLContextAttributes& attrs, const WebString& topDocumentURL, unsigned webGLVersion)
+Platform::ContextAttributes toPlatformContextAttributes(const WebGLContextAttributes& attrs, unsigned webGLVersion)
 {
-    WebGraphicsContext3D::Attributes result;
+    Platform::ContextAttributes result;
     result.failIfMajorPerformanceCaveat = attrs.failIfMajorPerformanceCaveat();
     result.shareResources = false;
     result.preferDiscreteGPU = true;
-    result.topDocumentURL = topDocumentURL;
     result.webGLVersion = webGLVersion;
     return result;
 }
 
 } // namespace blink