Use dictionaries for context creation attributes. Eliminate custom bindings.

Source/core/html/canvas/ContextAttributeHelpers.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 "config.h"
+#include "core/html/canvas/ContextAttributeHelpers.h"
+
+#include "core/frame/Settings.h"
+
+namespace blink {
+
+Canvas2DContextAttributes to2DContextAttributes(const CanvasContextCreationAttributes& attrs)
+{
+    Canvas2DContextAttributes result;
+    result.setAlpha(attrs.alpha());
+    return result;
+}
+
+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 blink::WebString& topDocumentURL, Settings* settings, unsigned webGLVersion)
+{
+    blink::WebGraphicsContext3D::Attributes result;
+    result.alpha = attrs.alpha();
+    result.depth = attrs.depth();
+    result.stencil = attrs.stencil();
+    result.antialias = attrs.antialias();
+    if (attrs.antialias()) {
+        if (settings && !settings->openGLMultisamplingEnabled())
+            result.antialias = false;
+    }
+    result.premultipliedAlpha = attrs.premultipliedAlpha();
+    result.failIfMajorPerformanceCaveat = attrs.failIfMajorPerformanceCaveat();
+
+    result.noExtensions = true;
+    result.shareResources = false;
+    result.preferDiscreteGPU = true;
+
+    result.topDocumentURL = topDocumentURL;
+
+    result.webGL = true;
+    result.webGLVersion = webGLVersion;
+    return result;
+}
+
+} // namespace blink