cc: Create ProxyBeginFrameSource

cc/test/layer_tree_test.h

Index: cc/test/layer_tree_test.h
diff --git a/cc/test/layer_tree_test.h b/cc/test/layer_tree_test.h
index 4e38ae6bb6b094b8d7a3793f2282a57bb139aba9..d4e40b2d9e5b05b6e67afc580f77a48df561c0f5 100644
--- a/cc/test/layer_tree_test.h
+++ b/cc/test/layer_tree_test.h
@@ -8,6 +8,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread.h"
 #include "cc/animation/animation_delegate.h"
+#include "cc/scheduler/begin_frame_source.h"
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/layer_tree_host_impl.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -200,6 +201,9 @@ class LayerTreeTest : public testing::Test, public TestHooks {
   bool delegating_renderer() const { return delegating_renderer_; }
   FakeOutputSurface* output_surface() { return output_surface_; }
   int LastCommittedSourceFrameNumber(LayerTreeHostImpl* impl) const;
+  ProxyBeginFrameSource* proxy_begin_frame_source() const {
+    return proxy_begin_frame_source_.get();
+  }
 
   void DestroyLayerTreeHost();
 
@@ -218,6 +222,7 @@ class LayerTreeTest : public testing::Test, public TestHooks {
   scoped_ptr<LayerTreeHost> layer_tree_host_;
   FakeOutputSurface* output_surface_;
   FakeExternalBeginFrameSource* external_begin_frame_source_;
+  scoped_ptr<ProxyBeginFrameSource> proxy_begin_frame_source_;
 
   bool beginning_;
   bool end_when_begin_returns_;