gfx: Add FrameTime and DisplayTime classes

cc/trees/layer_tree_impl.h

 // 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.
 
 #ifndef CC_TREES_LAYER_TREE_IMPL_H_
 #define CC_TREES_LAYER_TREE_IMPL_H_
 
 #include <list>
 #include <string>
 #include <vector>
 
 #include "base/containers/hash_tables.h"
 #include "base/values.h"
 #include "cc/layers/layer_impl.h"
 #include "cc/resources/ui_resource_client.h"
 #include "ui/events/latency_info.h"
+#include "ui/gfx/frame_time.h"
 
 #if defined(COMPILER_GCC)
 namespace BASE_HASH_NAMESPACE {
 template<>
 struct hash<cc::LayerImpl*> {
   size_t operator()(cc::LayerImpl* ptr) const {
     return hash<size_t>()(reinterpret_cast<size_t>(ptr));
   }
 };
 }  // namespace BASE_HASH_NAMESPACE
@@ skipping 40 matching lines @@
   PaintTimeCounter* paint_time_counter() const;
   MemoryHistory* memory_history() const;
   bool device_viewport_valid_for_tile_management() const;
   bool IsActiveTree() const;
   bool IsPendingTree() const;
   bool IsRecycleTree() const;
   LayerImpl* FindActiveTreeLayerById(int id);
   LayerImpl* FindPendingTreeLayerById(int id);
   int MaxTextureSize() const;
   bool PinchGestureActive() const;
-  base::TimeTicks CurrentFrameTimeTicks() const;
+  gfx::FrameTime CurrentFrameTimeTicks() const;
   base::Time CurrentFrameTime() const;
-  base::TimeTicks CurrentPhysicalTimeTicks() const;
+  gfx::FrameTime CurrentPhysicalFrameTime() const;
   void SetNeedsCommit();
   gfx::Size DrawViewportSize() const;
   void StartScrollbarAnimation();
 
   // Tree specific methods exposed to layer-impl tree.
   // ---------------------------------------------------------------------------
   void SetNeedsRedraw();
 
   // TODO(nduca): These are implemented in cc files temporarily, but will become
   // trivial accessors in a followup patch.
@@ skipping 179 matching lines @@
 
   UIResourceRequestQueue ui_resource_request_queue_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LayerTreeImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_IMPL_H_