Add rendering context and rendering 2D context to OffscreenCanvas

third_party/WebKit/Source/modules/offscreencanvas/OffscreenCanvasRenderingContext.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 "core/layout/LayoutThemeAndroid.h"
+#include "modules/offscreencanvas/OffscreenCanvasRenderingContext.h"
 
 namespace blink {
 
-PassRefPtr<LayoutTheme> LayoutThemeAndroid::create()
-{
-    return adoptRef(new LayoutThemeAndroid());
-}
-
-LayoutTheme& LayoutTheme::nativeTheme()
-{
-    DEFINE_STATIC_REF(LayoutTheme, layoutTheme, (LayoutThemeAndroid::create()));
-    return *layoutTheme;
-}
-
-LayoutThemeAndroid::~LayoutThemeAndroid()
+OffscreenCanvasRenderingContext::OffscreenCanvasRenderingContext(OffscreenCanvas* canvas)
+    : m_offscreenCanvas(canvas)
 {
 }
 
+OffscreenCanvasRenderingContext::ContextType OffscreenCanvasRenderingContext::contextTypeFromId(const String& id)
+{
+    if (id == "2d")
+        return Context2d;
+    if (id == "webgl")
+        return ContextWebgl;
+    if (id == "webgl2")
+        return ContextWebgl2;
+    return ContextTypeCount;
+}
+
+DEFINE_TRACE(OffscreenCanvasRenderingContext)
+{
+    visitor->trace(m_offscreenCanvas);
+}
+
 } // namespace blink