cc: Don't attempt main thread synchronization if it is slow.

cc/scheduler/scheduler_unittest.cc

Index: cc/scheduler/scheduler_unittest.cc
diff --git a/cc/scheduler/scheduler_unittest.cc b/cc/scheduler/scheduler_unittest.cc
index 6bdf5dd3eb678db3bd44c11236b5356e31c650b9..fa255cbcc7a11f841ad49d865bc8b6e8c7644e1b 100644
--- a/cc/scheduler/scheduler_unittest.cc
+++ b/cc/scheduler/scheduler_unittest.cc
@@ -485,8 +485,9 @@ TEST_F(SchedulerTest, SendBeginFramesToChildrenDeadlineNotAdjusted) {
   scheduler_settings_.use_external_begin_frame_source = true;
   SetUpScheduler(true);
 
-  fake_compositor_timing_history_->SetBeginMainFrameToCommitDurationEstimate(
-      base::TimeDelta::FromMilliseconds(2));
+  fake_compositor_timing_history_
+      ->SetBeginMainFrameStartToCommitDurationEstimate(
+          base::TimeDelta::FromMilliseconds(2));
   fake_compositor_timing_history_->SetCommitToReadyToActivateDurationEstimate(
       base::TimeDelta::FromMilliseconds(4));
   fake_compositor_timing_history_->SetDrawDurationEstimate(
@@ -1401,7 +1402,7 @@ TEST_F(SchedulerTest,
        MainFrameNotSkippedAfterLateCommitInPreferImplLatencyMode) {
   scheduler_settings_.use_external_begin_frame_source = true;
   SetUpScheduler(true);
-  scheduler_->SetImplLatencyTakesPriority(true);
+  scheduler_->SetSmoothnessMode(true, false);
 
   auto fast_duration = base::TimeDelta::FromMilliseconds(1);
   fake_compositor_timing_history_->SetAllEstimatesTo(fast_duration);
@@ -1418,8 +1419,8 @@ TEST_F(SchedulerTest,
   auto fast_duration = base::TimeDelta::FromMilliseconds(1);
   fake_compositor_timing_history_->SetAllEstimatesTo(fast_duration);
   auto slow_duration = base::TimeDelta::FromSeconds(1);
-  fake_compositor_timing_history_->SetBeginMainFrameToCommitDurationEstimate(
-      slow_duration);
+  fake_compositor_timing_history_
+      ->SetBeginMainFrameStartToCommitDurationEstimate(slow_duration);
 
   bool expect_send_begin_main_frame = true;
   EXPECT_SCOPED(
@@ -1578,7 +1579,7 @@ TEST_F(SchedulerTest,
   // Even if every estimate related to the main thread is slow, we should
   // still expect to recover impl thread latency if the draw is fast and we
   // are in impl latency takes priority.
-  scheduler_->SetImplLatencyTakesPriority(true);
+  scheduler_->SetSmoothnessMode(true, false);
   auto slow_duration = base::TimeDelta::FromSeconds(1);
   fake_compositor_timing_history_->SetAllEstimatesTo(slow_duration);
   auto fast_duration = base::TimeDelta::FromMilliseconds(1);
@@ -1718,8 +1719,8 @@ TEST_F(SchedulerTest,
   auto fast_duration = base::TimeDelta::FromMilliseconds(1);
   fake_compositor_timing_history_->SetAllEstimatesTo(fast_duration);
   auto slow_duration = base::TimeDelta::FromSeconds(1);
-  fake_compositor_timing_history_->SetBeginMainFrameToCommitDurationEstimate(
-      slow_duration);
+  fake_compositor_timing_history_
+      ->SetBeginMainFrameStartToCommitDurationEstimate(slow_duration);
   EXPECT_SCOPED(ImplFrameIsNotSkippedAfterLateSwapAck());
 }
 
@@ -3486,10 +3487,10 @@ TEST_F(SchedulerTest, AuthoritativeVSyncInterval) {
 
 TEST_F(SchedulerTest, ImplLatencyTakesPriority) {
   SetUpScheduler(true);
-  scheduler_->SetImplLatencyTakesPriority(true);
+  scheduler_->SetSmoothnessMode(true, false);
   EXPECT_TRUE(scheduler_->ImplLatencyTakesPriority());
 
-  scheduler_->SetImplLatencyTakesPriority(false);
+  scheduler_->SetSmoothnessMode(false, false);
   EXPECT_FALSE(scheduler_->ImplLatencyTakesPriority());
 }
 
@@ -3497,7 +3498,7 @@ TEST_F(SchedulerTest, BeginMainFrameArgs_OnCriticalPath) {
   scheduler_settings_.use_external_begin_frame_source = true;
   SetUpScheduler(true);
 
-  scheduler_->SetImplLatencyTakesPriority(false);
+  scheduler_->SetSmoothnessMode(false, false);
   scheduler_->SetNeedsBeginMainFrame();
 
   client_->Reset();
@@ -3511,7 +3512,7 @@ TEST_F(SchedulerTest, BeginMainFrameArgs_NotOnCriticalPath) {
   scheduler_settings_.use_external_begin_frame_source = true;
   SetUpScheduler(true);
 
-  scheduler_->SetImplLatencyTakesPriority(true);
+  scheduler_->SetSmoothnessMode(true, false);
   scheduler_->SetNeedsBeginMainFrame();
 
   client_->Reset();