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

cc/scheduler/scheduler_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/scheduler/scheduler.h"
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 2898 matching lines @@
   EXPECT_NO_ACTION(client_);
 
   // Allow new commit even though previous commit hasn't been drawn.
   scheduler_->NotifyReadyToCommit();
   EXPECT_SINGLE_ACTION("ScheduledActionCommit", client_);
   client_->Reset();
 }
 
 TEST_F(SchedulerTest, AuthoritativeVSyncInterval) {
   SetUpScheduler(true);
-
-  base::TimeDelta initial_interval =
-      scheduler_->begin_impl_frame_args().interval;
+  base::TimeDelta initial_interval = scheduler_->BeginImplFrameInterval();
   base::TimeDelta authoritative_interval =
       base::TimeDelta::FromMilliseconds(33);
 
   scheduler_->SetNeedsCommit();
   EXPECT_SCOPED(AdvanceFrame());
 
-  EXPECT_EQ(initial_interval, scheduler_->begin_impl_frame_args().interval);
+  EXPECT_EQ(initial_interval, scheduler_->BeginImplFrameInterval());
 
   scheduler_->NotifyBeginMainFrameStarted();
   scheduler_->NotifyReadyToCommit();
   task_runner().RunTasksWhile(client_->ImplFrameDeadlinePending(true));
 
   scheduler_->SetAuthoritativeVSyncInterval(authoritative_interval);
 
   EXPECT_SCOPED(AdvanceFrame());
 
   // At the next BeginFrame, authoritative interval is used instead of previous
   // interval.
-  EXPECT_NE(initial_interval, scheduler_->begin_impl_frame_args().interval);
-  EXPECT_EQ(authoritative_interval,
-            scheduler_->begin_impl_frame_args().interval);
+  EXPECT_NE(initial_interval, scheduler_->BeginImplFrameInterval());
+  EXPECT_EQ(authoritative_interval, scheduler_->BeginImplFrameInterval());
 }
 
 }  // namespace
 }  // namespace cc