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/debug/trace_event.h"
@@ skipping 1128 matching lines @@
   EXPECT_EQ(scheduler->MainThreadIsInHighLatencyMode(),
             should_send_begin_main_frame);
   EXPECT_EQ(client.HasAction("ScheduledActionSendBeginMainFrame"),
             should_send_begin_main_frame);
 }
 
 TEST(SchedulerTest,
     SkipMainFrameIfHighLatencyAndCanCommitAndActivateBeforeDeadline) {
   // Set up client so that estimates indicate that we can commit and activate
   // before the deadline (~8ms by default).
-  MainFrameInHighLatencyMode(1, 1, false, false);
+  EXPECT_SCOPED(MainFrameInHighLatencyMode(1, 1, false, false));
 }
 
 TEST(SchedulerTest, NotSkipMainFrameIfHighLatencyAndCanCommitTooLong) {
   // Set up client so that estimates indicate that the commit cannot finish
   // before the deadline (~8ms by default).
-  MainFrameInHighLatencyMode(10, 1, false, true);
+  EXPECT_SCOPED(MainFrameInHighLatencyMode(10, 1, false, true));
 }
 
 TEST(SchedulerTest, NotSkipMainFrameIfHighLatencyAndCanActivateTooLong) {
   // Set up client so that estimates indicate that the activate cannot finish
   // before the deadline (~8ms by default).
-  MainFrameInHighLatencyMode(1, 10, false, true);
+  EXPECT_SCOPED(MainFrameInHighLatencyMode(1, 10, false, true));
 }
 
 TEST(SchedulerTest, NotSkipMainFrameInPreferImplLatencyMode) {
   // Set up client so that estimates indicate that we can commit and activate
   // before the deadline (~8ms by default), but also enable impl latency takes
   // priority mode.
-  MainFrameInHighLatencyMode(1, 1, true, true);
+  EXPECT_SCOPED(MainFrameInHighLatencyMode(1, 1, true, true));
 }
 
 TEST(SchedulerTest, PollForCommitCompletion) {
   // Since we are simulating a long commit, set up a client with draw duration
   // estimates that prevent skipping main frames to get to low latency mode.
   SchedulerClientWithFixedEstimates client(
       base::TimeDelta::FromMilliseconds(1),
       base::TimeDelta::FromMilliseconds(32),
       base::TimeDelta::FromMilliseconds(32));
   SchedulerSettings scheduler_settings;
@@ skipping 1016 matching lines @@
 
   // Deadline task is pending
   EXPECT_TRUE(scheduler->BeginImplFrameDeadlinePending());
   client.task_runner().RunPendingTasks();
   // Deadline task runs immediately
   EXPECT_FALSE(scheduler->BeginImplFrameDeadlinePending());
 }
 
 }  // namespace
 }  // namespace cc