Use ContextProvider subclass to provide WGC3D pointers

webkit/common/gpu/context_provider_web_context.h

Index: webkit/common/gpu/context_provider_web_context.h
diff --git a/webkit/common/gpu/context_provider_web_context.h b/webkit/common/gpu/context_provider_web_context.h
new file mode 100644
index 0000000000000000000000000000000000000000..8ee8adb1273eb7823f2c45f0307a1bf80ce0bd35
--- /dev/null
+++ b/webkit/common/gpu/context_provider_web_context.h
@@ -0,0 +1,26 @@
+// Copyright (c) 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.
+
+#ifndef WEBKIT_COMMON_GPU_CONTEXT_PROVIDER_WEB_CONTEXT_H_
+#define WEBKIT_COMMON_GPU_CONTEXT_PROVIDER_WEB_CONTEXT_H_
+
+#include "cc/output/context_provider.h"
+
+namespace blink { class WebGraphicsContext3D; }
+
+namespace webkit {
+namespace gpu {
+
+class ContextProviderWebContext : public cc::ContextProvider {
+ public:
+  virtual blink::WebGraphicsContext3D* WebContext3D() = 0;
+
+ protected:
+  virtual ~ContextProviderWebContext() {}
+};
+
+}  // namespace gpu
+}  // namespace webkit
+
+#endif  // WEBKIT_COMMON_GPU_CONTEXT_PROVIDER_WEB_CONTEXT_H_