cc: Adding BeginFrameTracker object and removing Now() from LTHI.

cc/resources/tile_manager_perftest.cc

 // Copyright 2013 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 "base/time/time.h"
 #include "cc/debug/lap_timer.h"
 #include "cc/resources/raster_buffer.h"
 #include "cc/resources/tile.h"
 #include "cc/resources/tile_priority.h"
 #include "cc/test/begin_frame_args_test.h"
@@ skipping 381 matching lines @@
   void RunPrepareTilesTest(const std::string& test_name,
                            int layer_count,
                            int approximate_tile_count_per_layer) {
     std::vector<LayerImpl*> layers =
         CreateLayers(layer_count, approximate_tile_count_per_layer);
     timer_.Reset();
     bool resourceless_software_draw = false;
     do {
       BeginFrameArgs args =
           CreateBeginFrameArgsForTesting(BEGINFRAME_FROM_HERE);
-      host_impl_.UpdateCurrentBeginFrameArgs(args);
+      host_impl_.WillBeginImplFrame(args);
       for (unsigned i = 0; i < layers.size(); ++i) {
         layers[i]->UpdateTiles(Occlusion(), resourceless_software_draw);
       }
 
       GlobalStateThatImpactsTilePriority global_state(GlobalStateForTest());
       tile_manager()->PrepareTiles(global_state);
       tile_manager()->UpdateVisibleTiles();
       timer_.NextLap();
       host_impl_.ResetCurrentBeginFrameArgsForNextFrame();
     } while (!timer_.HasTimeLimitExpired());
@@ skipping 73 matching lines @@
   RunEvictionQueueConstructAndIterateTest("10_128", 10, 128);
   RunEvictionQueueConstructAndIterateTest("50_16", 50, 16);
   RunEvictionQueueConstructAndIterateTest("50_32", 50, 32);
   RunEvictionQueueConstructAndIterateTest("50_64", 50, 64);
   RunEvictionQueueConstructAndIterateTest("50_128", 50, 128);
 }
 
 }  // namespace
 
 }  // namespace cc