Use ContextProvider subclass to provide WGC3D pointers

content/common/gpu/client/context_provider_web_context.h

Index: content/common/gpu/client/context_provider_web_context.h
diff --git a/content/common/gpu/client/context_provider_web_context.h b/content/common/gpu/client/context_provider_web_context.h
new file mode 100644
index 0000000000000000000000000000000000000000..ee1ddf31db194dfa7bb7ba2e88c3a9f1c4281b27
--- /dev/null
+++ b/content/common/gpu/client/context_provider_web_context.h
@@ -0,0 +1,25 @@
+// Copyright (c) 2013 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 CONTENT_RENDERER_CONTEXT_PROVIDER_WEB_CONTEXT_H_
+#define CONTENT_RENDERER_CONTEXT_PROVIDER_WEB_CONTEXT_H_
+
+#include "cc/output/context_provider.h"
+
+namespace blink { class WebGraphicsContext3D; }
+
+namespace content {
+
+class ContextProviderWebContext : public cc::ContextProvider {
+ public:
+  virtual blink::WebGraphicsContext3D* WebContext3D() = 0;
+
+ protected:
+  friend class RefCountedThreadSafe<ContextProviderWebContext>;

[piman, 2014/01/08 01:22:50]

nit: why do you need this?

[jamesr, 2014/01/08 02:20:15]

hmm, thought that i did since the d'tor is protected but the compiler says i
don't. removed

[piman, 2014/01/08 02:26:41]

One thing that gives it away is that the
RefCountedThreadSafe<ContextProviderWebContext> specialization is never
otherwise instantiated :)
scoped_refptr<ContextProviderWebContext> would call
cc::ContextProvider::Release() which is
RefCountedThreadSafe<cc::ContextProvider>::Release(), that would call
cc::ContextProvider::~ContextProvider (which is fine since ContextProvider
friends RefCountedThreadSafe<cc::ContextProvider>), which, being virtual, ends
up being ContextProviderWebContext::~ContextProviderWebContext().

+  virtual ~ContextProviderWebContext() {}
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_CONTEXT_PROVIDER_WEB_CONTEXT_H_