Pipe impl_latency_takes_priority_ to the RenderScheduler.

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 3fc5c062dac2c871096d08609064883b14892e76..ad47b5924596b3adbb43873e08555a5814f11ee2 100644
--- a/cc/scheduler/scheduler_unittest.cc
+++ b/cc/scheduler/scheduler_unittest.cc
@@ -3003,5 +3003,38 @@ TEST_F(SchedulerTest, AuthoritativeVSyncInterval) {
   EXPECT_EQ(authoritative_interval, scheduler_->BeginImplFrameInterval());
 }
 
+TEST_F(SchedulerTest, MainThreadOnCriticalPath) {
+  SetUpScheduler(true);
+  scheduler_->SetImplLatencyTakesPriority(true);
+  EXPECT_FALSE(scheduler_->MainThreadOnCriticalPath());
+
+  scheduler_->SetImplLatencyTakesPriority(false);
+  EXPECT_TRUE(scheduler_->MainThreadOnCriticalPath());
+}
+
+TEST_F(SchedulerTest, BeginFrameArgs_OnCriticalPath) {
+  scheduler_settings_.use_external_begin_frame_source = true;
+  SetUpScheduler(true);
+
+  scheduler_->SetImplLatencyTakesPriority(false);
+  scheduler_->SetChildrenNeedBeginFrames(true);
+
+  EXPECT_SCOPED(AdvanceFrame());
+  EXPECT_TRUE(client_->begin_frame_is_sent_to_children());
+  EXPECT_TRUE(client_->begin_frame_args_sent_to_children().on_critical_path);
+}
+
+TEST_F(SchedulerTest, BeginFrameArgs_NotOnCriticalPath) {
+  scheduler_settings_.use_external_begin_frame_source = true;
+  SetUpScheduler(true);
+
+  scheduler_->SetImplLatencyTakesPriority(true);
+  scheduler_->SetChildrenNeedBeginFrames(true);
+
+  EXPECT_SCOPED(AdvanceFrame());
+  EXPECT_TRUE(client_->begin_frame_is_sent_to_children());
+  EXPECT_FALSE(client_->begin_frame_args_sent_to_children().on_critical_path);
+}
+
 }  // namespace
 }  // namespace cc