cc: Control defer_commits logic by Scheduler

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 deea726b4bf6bf7f1f976e9571772b8fcea7fbce..51b885ec9dbc86b8e6905fc5af51ecd6aa45a2de 100644
--- a/cc/scheduler/scheduler_unittest.cc
+++ b/cc/scheduler/scheduler_unittest.cc
@@ -463,6 +463,84 @@ TEST(SchedulerTest, RequestCommit) {
   client.Reset();
 }
 
+TEST(SchedulerTest, RequestCommitAfterSetDeferCommit) {
+  FakeSchedulerClient client;
+  SchedulerSettings scheduler_settings;
+  scheduler_settings.use_external_begin_frame_source = true;
+  TestScheduler* scheduler = client.CreateScheduler(scheduler_settings);
+  scheduler->SetCanStart();
+  scheduler->SetVisible(true);
+  scheduler->SetCanDraw(true);
+
+  InitializeOutputSurfaceAndFirstCommit(scheduler, &client);
+  client.Reset();
+
+  scheduler->SetDeferCommits(true);
+
+  scheduler->SetNeedsCommit();
+  EXPECT_SINGLE_ACTION("SetNeedsBeginFrames(true)", client);
+
+  client.Reset();
+  client.AdvanceFrame();
+  // BeginMainFrame is not sent during the defer commit is on.
+  EXPECT_SINGLE_ACTION("WillBeginImplFrame", client);
+
+  client.Reset();
+  client.task_runner().RunPendingTasks();  // Run posted deadline.
+  // There is no posted deadline.
+  EXPECT_NO_ACTION(client);
+  EXPECT_TRUE(client.needs_begin_frames());
+
+  client.Reset();
+  scheduler->SetDeferCommits(false);
+  EXPECT_NO_ACTION(client);
+
+  // Start new BeginMainFrame after defer commit is off.
+  client.Reset();
+  client.AdvanceFrame();
+  EXPECT_ACTION("WillBeginImplFrame", client, 0, 2);
+  EXPECT_ACTION("ScheduledActionSendBeginMainFrame", client, 1, 2);
+  EXPECT_TRUE(scheduler->BeginImplFrameDeadlinePending());
+}
+
+TEST(SchedulerTest, DeferCommitWithRedraw) {
+  FakeSchedulerClient client;
+  SchedulerSettings scheduler_settings;
+  scheduler_settings.use_external_begin_frame_source = true;
+  TestScheduler* scheduler = client.CreateScheduler(scheduler_settings);
+  scheduler->SetCanStart();
+  scheduler->SetVisible(true);
+  scheduler->SetCanDraw(true);
+
+  InitializeOutputSurfaceAndFirstCommit(scheduler, &client);
+  client.Reset();
+
+  scheduler->SetDeferCommits(true);
+
+  scheduler->SetNeedsCommit();
+  EXPECT_SINGLE_ACTION("SetNeedsBeginFrames(true)", client);
+
+  client.Reset();
+  scheduler->SetNeedsRedraw();
+  EXPECT_NO_ACTION(client);
+
+  client.Reset();
+  client.AdvanceFrame();
+  // BeginMainFrame is not sent during the defer commit is on.
+  EXPECT_ACTION("WillBeginImplFrame", client, 0, 2);
+  EXPECT_ACTION("ScheduledActionAnimate", client, 1, 2);
+
+  client.Reset();
+  client.task_runner().RunPendingTasks();  // Run posted deadline.
+  EXPECT_SINGLE_ACTION("ScheduledActionDrawAndSwapIfPossible", client);
+  EXPECT_FALSE(scheduler->BeginImplFrameDeadlinePending());
+  EXPECT_TRUE(client.needs_begin_frames());
+
+  client.Reset();
+  client.AdvanceFrame();
+  EXPECT_SINGLE_ACTION("WillBeginImplFrame", client);
+}
+
 TEST(SchedulerTest, RequestCommitAfterBeginMainFrameSent) {
   FakeSchedulerClient client;
   SchedulerSettings scheduler_settings;