Add LayerTreeHostSettings for synchronous compositor

cc/scheduler/vsync_time_source_unittest.cc

 // Copyright 2013 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/vsync_time_source.h"
 
 #include "cc/test/scheduler_test_common.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
@@ skipping 14 matching lines @@
     if (client_)
       client_->DidVSync(frame_time);
   }
 
  private:
   VSyncClient* client_;
 };
 
 class VSyncTimeSourceTest : public testing::Test {
  public:
-  VSyncTimeSourceTest() : timer_(VSyncTimeSource::Create(&provider_)) {
+  VSyncTimeSourceTest()
+      : timer_(VSyncTimeSource::Create(
+          &provider_, VSyncTimeSource::DISABLE_ON_NEXT_TICK)) {
     timer_->SetClient(&client_);
   }
 
  protected:
   FakeTimeSourceClient client_;
   FakeVSyncProvider provider_;
   scoped_refptr<VSyncTimeSource> timer_;
 };
 
 TEST_F(VSyncTimeSourceTest, TaskPostedAndTickCalled) {
@@ skipping 27 matching lines @@
   EXPECT_FALSE(provider_.IsVSyncNotificationEnabled());
   EXPECT_FALSE(client_.TickCalled());
 
   // The notification should not be disabled multiple times.
   provider_.RequestVSyncNotification(timer_.get());
   provider_.Trigger(frame_time);
   EXPECT_TRUE(provider_.IsVSyncNotificationEnabled());
   EXPECT_FALSE(client_.TickCalled());
 }
 
+TEST_F(VSyncTimeSourceTest, NotificationDisabledImmediatelyForSetting) {
+  timer_ = VSyncTimeSource::Create(&provider_,
+                                   VSyncTimeSource::DISABLE_SYNCHRONOUSLY);
+  timer_->SetClient(&client_);
+  base::TimeTicks frame_time = base::TimeTicks::Now();
+
+  // Enable timer and trigger sync once.
+  timer_->SetActive(true);
+  EXPECT_TRUE(provider_.IsVSyncNotificationEnabled());
+  provider_.Trigger(frame_time);
+  EXPECT_TRUE(client_.TickCalled());
+
+  // Disable timer should disable vsync notification immediately.
+  timer_->SetActive(false);
+  EXPECT_FALSE(provider_.IsVSyncNotificationEnabled());
+
+  // Enable again and timer can be ticked again.
+  client_.Reset();
+  timer_->SetActive(true);
+  EXPECT_TRUE(provider_.IsVSyncNotificationEnabled());
+  provider_.Trigger(frame_time);
+  EXPECT_TRUE(client_.TickCalled());
+}
+
 TEST_F(VSyncTimeSourceTest, ValidNextTickTime) {
   base::TimeTicks frame_time = base::TimeTicks::Now();
   base::TimeDelta interval = base::TimeDelta::FromSeconds(1);
 
   ASSERT_EQ(timer_->NextTickTime(), base::TimeTicks());
 
   timer_->SetActive(true);
   provider_.Trigger(frame_time);
   ASSERT_EQ(timer_->NextTickTime(), frame_time);
 
   timer_->SetTimebaseAndInterval(frame_time, interval);
   ASSERT_EQ(timer_->NextTickTime(), frame_time + interval);
 }
 
 }  // namespace
 }  // namespace cc