cc: Emulate BeginFrame in OutputSurfaces that don't support it natively

cc/trees/proxy.h

 // Copyright 2011 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 CC_TREES_PROXY_H_
 #define CC_TREES_PROXY_H_
 
+#include <string>
+
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "base/values.h"
 #include "cc/base/cc_export.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
 namespace gfx {
@@ skipping 73 matching lines @@
   // Maximum number of sub-region texture updates supported for each commit.
   virtual size_t MaxPartialTextureUpdates() const = 0;
 
   virtual void AcquireLayerTextures() = 0;
 
   virtual skia::RefPtr<SkPicture> CapturePicture() = 0;
   virtual scoped_ptr<base::Value> AsValue() const = 0;
 
   // Testing hooks
   virtual bool CommitPendingForTesting() = 0;
+  virtual std::string SchedulerStateAsStringForTesting();
 
  protected:
   explicit Proxy(scoped_ptr<Thread> impl_thread);
   friend class DebugScopedSetImplThread;
   friend class DebugScopedSetMainThread;
   friend class DebugScopedSetMainThreadBlocked;
 
  private:
   scoped_ptr<Thread> main_thread_;
   scoped_ptr<Thread> impl_thread_;
@@ skipping 26 matching lines @@
   explicit DebugScopedSetMainThreadBlocked(Proxy* proxy) {}
   ~DebugScopedSetMainThreadBlocked() {}
  private:
   DISALLOW_COPY_AND_ASSIGN(DebugScopedSetMainThreadBlocked);
 };
 #endif
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROXY_H_