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

content/common/gpu/client/offscreen_context.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_H_
+#define CONTENT_COMMON_GPU_CLIENT_OFFSCREEN_CONTEXT_H_
+
+#include "skia/ext/refptr.h"
+
+class GrContext;
+namespace WebKit { class WebGraphicsContext3D; }
+
+namespace content {
+
+// This class lazily creates an offscreen GrContext that is bound to an
+// offscreen context lazily created by its subclass implementation.
+class OffscreenContext {
+ public:
+  OffscreenContext();
+  virtual ~OffscreenContext();
+
+  virtual WebKit::WebGraphicsContext3D* Context3d() = 0;
+  class GrContext* GrContext();
+
+ protected:
+  void SetGaneshContextMemoryLimit(bool nonzero_allocation);
+  void DidLoseContext();
+
+ private:
+  // The limit of the number of textures we hold in the GrContext's
+  // bitmap->texture cache.
+  static const int kMaxGaneshTextureCacheCount = 2048;
+  // The limit of the bytes allocated toward textures in the GrContext's
+  // bitmap->texture cache.
+  static const size_t kMaxGaneshTextureCacheBytes = 96 * 1024 * 1024;
+
+  skia::RefPtr<class GrContext> gr_context_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_CLIENT_OFFSCREEN_CONTEXT_H_