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

content/common/gpu/client/offscreen_context_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_OFFSCREEN_CONTEXT_COMMAND_BUFFER_H_
+#define CONTENT_COMMON_GPU_CLIENT_OFFSCREEN_CONTEXT_COMMAND_BUFFER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "content/common/gpu/client/offscreen_context.h"
+#include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
+#include "skia/ext/refptr.h"
+
+namespace content {
+class OffscreenContextCommandBuffer;
+
+class OffscreenContextCommandBufferClient {
+ public:
+  virtual WebGraphicsContext3DCommandBufferImpl* CreateOffscreenContext() = 0;
+
+  virtual void DidLoseContext(
+      OffscreenContextCommandBuffer* offscreen_context) = 0;
+  virtual void DidCreateContext(
+      OffscreenContextCommandBuffer* offscreen_context,
+      bool success) = 0;
+};
+
+// This class lazily creates an offscreen context with a command buffer.
+class OffscreenContextCommandBuffer
+    : public OffscreenContext,
+      public WebKit::WebGraphicsContext3D::WebGraphicsContextLostCallback,
+      public WebKit::WebGraphicsContext3D::
+          WebGraphicsMemoryAllocationChangedCallbackCHROMIUM {
+ public:
+  explicit OffscreenContextCommandBuffer(
+      OffscreenContextCommandBufferClient* client);
+  virtual ~OffscreenContextCommandBuffer();
+
+  virtual WebGraphicsContext3DCommandBufferImpl* Context3d() OVERRIDE;
+
+ private:
+  // WebGraphicsContextLostCallback implementation.
+  virtual void onContextLost() OVERRIDE;
+  // WebGraphicsMemoryAllocationChangedCallbackCHROMIUM implementation.
+  virtual void onMemoryAllocationChanged(
+      WebKit::WebGraphicsMemoryAllocation allocation) OVERRIDE;
+
+  OffscreenContextCommandBufferClient* client_;
+  scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context3d_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_CLIENT_OFFSCREEN_CONTEXT_COMMAND_BUFFER_H_