Ensure LayerTreeHostImpl's current frame time is updated every frame

cc/trees/layer_tree_host_unittest_scroll.cc

 // Copyright 2012 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.h"
 
 #include "cc/base/thread_impl.h"
 #include "cc/layers/content_layer.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_impl.h"
@@ skipping 583 matching lines @@
                        initial_scroll_ + impl_thread_scroll1_);
 
       // Pretend like Javascript updated the scroll position itself with a
       // change of main_thread_scroll.
       root->SetScrollOffset(initial_scroll_ +
                             main_thread_scroll_ +
                             impl_thread_scroll1_);
     }
   }
 
-  virtual bool CanActivatePendingTree() OVERRIDE {
+  virtual bool CanActivatePendingTree(LayerTreeHostImpl* impl) OVERRIDE {
     return can_activate_;
   }
 
   virtual void CommitCompleteOnThread(LayerTreeHostImpl* impl) OVERRIDE {
     // We force a second draw here of the first commit before activating
     // the second commit.
     if (impl->active_tree()->source_frame_number() == 0)
       impl->SetNeedsRedraw();
   }
 
@@ skipping 178 matching lines @@
       LayerTreeHost::Create(&client, settings, impl_ccthread.Pass());
 
   layer_tree_host->DidStopFlinging();
   layer_tree_host.reset();
   impl_thread.Stop();
   EXPECT_TRUE(received_stop_flinging);
 }
 
 }  // namespace
 }  // namespace cc