cc: Add support for sending BeginFrames for video.

cc/trees/layer_tree_host_impl_unittest.cc

 // 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.
 
 #include "cc/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/bind.h"
@@ skipping 124 matching lines @@
   void NotifyReadyToDraw() override {}
   void SetNeedsRedrawOnImplThread() override { did_request_redraw_ = true; }
   void SetNeedsRedrawRectOnImplThread(const gfx::Rect& damage_rect) override {
     did_request_redraw_ = true;
   }
   void SetNeedsAnimateOnImplThread() override { did_request_animate_ = true; }
   void SetNeedsPrepareTilesOnImplThread() override {
     did_request_prepare_tiles_ = true;
   }
   void SetNeedsCommitOnImplThread() override { did_request_commit_ = true; }
+  void SetVideoNeedsBeginFrames(bool needs_begin_frames) override {}
   void PostAnimationEventsToMainThreadOnImplThread(
       scoped_ptr<AnimationEventsVector> events) override {}
   bool ReduceContentsTextureMemoryOnImplThread(size_t limit_bytes,
                                                int priority_cutoff) override {
     current_limit_bytes_ = limit_bytes;
     current_priority_cutoff_value_ = priority_cutoff;
     return reduce_memory_result_;
   }
   bool IsInsideDraw() override { return false; }
   void RenewTreePriority() override {}
@@ skipping 8282 matching lines @@
   // surface.
   EXPECT_EQ(0, num_lost_surfaces_);
   host_impl_->DidLoseOutputSurface();
   EXPECT_EQ(1, num_lost_surfaces_);
   host_impl_->DidLoseOutputSurface();
   EXPECT_LE(1, num_lost_surfaces_);
 }
 
 }  // namespace
 }  // namespace cc