Adds a didReceiveInputEvent api to the blink scheduler

Source/platform/scheduler/SchedulerTest.cpp

Index: Source/platform/scheduler/SchedulerTest.cpp
diff --git a/Source/platform/scheduler/SchedulerTest.cpp b/Source/platform/scheduler/SchedulerTest.cpp
index 4a3d9dfa07dc24b8f890c3bca349bce39b9d2b2d..d1243b069c50cd6f325ca07787175938be5109d4 100644
--- a/Source/platform/scheduler/SchedulerTest.cpp
+++ b/Source/platform/scheduler/SchedulerTest.cpp
@@ -432,6 +432,14 @@ TEST_F(SchedulerTest, TestInputEventTriggersShouldYield)
     EXPECT_TRUE(m_scheduler->shouldYieldForHighPriorityWork());
 }
 
+TEST_F(SchedulerTest, TestDidReceiveInputEventDoesNotTriggerShouldYield)
+{
+    ASSERT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
+    m_scheduler->didReceiveInputEvent();
+
+    ASSERT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
+}
+
 TEST_F(SchedulerTest, TestCompositorEventDoesNotTriggerShouldYield_InNormalMode)
 {
     ASSERT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
@@ -440,6 +448,16 @@ TEST_F(SchedulerTest, TestCompositorEventDoesNotTriggerShouldYield_InNormalMode)
     EXPECT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
 }
 
+TEST_F(SchedulerTest, TestCompositorEventDoesTriggerShouldYield_InLowLatencyMode)
+{
+    m_scheduler->didReceiveInputEvent();
+
+    ASSERT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
+    m_scheduler->postCompositorTask(FROM_HERE, WTF::bind(&dummyTask));
+
+    EXPECT_TRUE(m_scheduler->shouldYieldForHighPriorityWork());
+}
+
 TEST_F(SchedulerTest, TestInputEventTriggersLowLatencyMode)
 {
     m_scheduler->postInputTask(FROM_HERE, WTF::bind(&dummyTask));
@@ -466,4 +484,21 @@ TEST_F(SchedulerTest, TestCompositorEvent_LowLatencyModeDoesntLastLongWithoutInp
     EXPECT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
 }
 
+TEST_F(SchedulerTest, testDidReceiveInputEvent_DoesntTriggerLowLatencyModeForLong)
+{
+    SchedulerTestingPlatformSupport::setDebugTime(1000.0);
+
+    // Note the latency mode gets reset by executeHighPriorityTasks, so we need a dummy task here
+    // to make sure runPendingTasks triggers executeHighPriorityTasks.
+    m_scheduler->postCompositorTask(FROM_HERE, WTF::bind(&dummyTask));
+    m_scheduler->didReceiveInputEvent();
+    SchedulerTestingPlatformSupport::setDebugTime(1000.5);
+    runPendingTasks();
+
+    ASSERT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
+    m_scheduler->postCompositorTask(FROM_HERE, WTF::bind(&dummyTask));
+
+    EXPECT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
+}
+
 } // namespace