cc: Route offscreen context creation for compositor to the browser.

content/common/gpu/client/context_provider_command_buffer.h

+// 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_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER
+#define CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER
+
+#include "base/memory/scoped_ptr.h"
+#include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
+#include "ui/gl/context_provider.h"
+
+namespace webkit {
+namespace gpu {
+class GrContextForWebGraphicsContext3D;
+}
+}
+
+namespace content {
+
+// Implementation of ui::ContextProvider that provides a
+// WebGraphicsContext3DCommandBufferImpl context and a GrContext.
+class ContextProviderCommandBuffer : public ui::ContextProvider {
+ public:
+  ContextProviderCommandBuffer();
+
+  virtual bool InitializeOnMainThread() OVERRIDE;
+  virtual bool BindToCurrentThread() OVERRIDE;
+  virtual WebGraphicsContext3DCommandBufferImpl* Context3d() OVERRIDE;
+  virtual class GrContext* GrContext() OVERRIDE;
+  virtual void VerifyContexts() OVERRIDE;
+
+  bool destroyed() const { return destroyed_; }
+
+ protected:
+  virtual ~ContextProviderCommandBuffer();
+
+  // Subclass must provide an implementation to create an offscreen context.
+  virtual scoped_ptr<WebGraphicsContext3DCommandBufferImpl>
+      CreateOffscreenContext3d() = 0;
+
+  virtual void OnLostContext();
+  virtual void OnMemoryAllocationChanged(bool nonzero_allocation);
+
+ private:
+
+  scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context3d_;
+  scoped_ptr<webkit::gpu::GrContextForWebGraphicsContext3D> gr_context_;
+  bool destroyed_;
+
+  class LostContextCallbackProxy;
+  scoped_ptr<LostContextCallbackProxy> lost_context_callback_proxy_;
+
+  class MemoryAllocationCallbackProxy;
+  scoped_ptr<MemoryAllocationCallbackProxy> memory_allocation_callback_proxy_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER