Adds a didReceiveInputEvent api to the blink scheduler

Source/platform/scheduler/SchedulerTest.cpp

 // Copyright 2014 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 "config.h"
 #include "platform/scheduler/Scheduler.h"
 
 #include "platform/TestingPlatformSupport.h"
 #include "platform/TraceLocation.h"
 #include "public/platform/Platform.h"
@@ skipping 158 matching lines @@
     ~SchedulerTest()
     {
         Scheduler::shutdown();
     }
 
     virtual void SetUp() OVERRIDE
     {
         m_scheduler->enterSchedulerPolicy(SchedulerForTest::Normal);
     }
 
+    virtual void TearDown() OVERRIDE
+    {
+        // If the Scheduler hasn't been shut down then explicitly flush the tasks.
+        if (Scheduler::shared())
+            runPendingTasks();
+    }
+
     void runPendingTasks()
     {
         m_platformSupport.runPendingTasks();
     }
 
     void appendToVector(std::string value)
     {
         m_order.push_back(value);
     }
 
@@ skipping 271 matching lines @@
     m_scheduler->setSharedTimerFiredFunction(nullptr);
 }
 
 TEST_F(SchedulerTest, TestInputEventDoesNotTriggerShouldYield_InNormalMode)
 {
     m_scheduler->postInputTask(FROM_HERE, WTF::bind(&dummyTask));
 
     EXPECT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
 }
 
+TEST_F(SchedulerTest, TestDidReceiveInputEventDoesNotTriggerShouldYield)
+{
+    m_scheduler->didReceiveInputEvent();
+
+    EXPECT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
+}
+
 TEST_F(SchedulerTest, TestCompositorEventDoesNotTriggerShouldYield_InNormalMode)
 {
     m_scheduler->postCompositorTask(FROM_HERE, WTF::bind(&dummyTask));
 
     EXPECT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
 }
 
-TEST_F(SchedulerTest, TestInputEventDoesTriggerShouldYield_InLowSchedulerPolicy)
+TEST_F(SchedulerTest, TestCompositorEventDoesTriggerShouldYieldAfterDidReceiveInputEvent)
+{
+    m_scheduler->didReceiveInputEvent();
+
+    ASSERT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
+    m_scheduler->postCompositorTask(FROM_HERE, WTF::bind(&dummyTask));
+
+    EXPECT_TRUE(m_scheduler->shouldYieldForHighPriorityWork());
+}
+
+TEST_F(SchedulerTest, TestInputEventDoesTriggerShouldYield_InCompositorPriorityMode)
 {
     m_scheduler->enterSchedulerPolicy(SchedulerForTest::CompositorPriority);
     m_scheduler->postInputTask(FROM_HERE, WTF::bind(&dummyTask));
 
     EXPECT_TRUE(m_scheduler->shouldYieldForHighPriorityWork());
 }
 
-TEST_F(SchedulerTest, TestCompositorEventDoesTriggerShouldYield_InLowSchedulerPolicy)
+TEST_F(SchedulerTest, TestCompositorEventDoesTriggerShouldYield_InCompositorPriorityMode)
 {
     m_scheduler->enterSchedulerPolicy(SchedulerForTest::CompositorPriority);
     m_scheduler->postCompositorTask(FROM_HERE, WTF::bind(&dummyTask));
 
     EXPECT_TRUE(m_scheduler->shouldYieldForHighPriorityWork());
 }
 
 TEST_F(SchedulerTest, TestCompositorEvent_LowSchedulerPolicyDoesntLastLong)
 {
     m_platformSupport.setMonotonicTimeForTest(1000.0);
 
     m_scheduler->enterSchedulerPolicy(SchedulerForTest::CompositorPriority);
     m_scheduler->postInputTask(FROM_HERE, WTF::bind(&dummyTask));
     m_platformSupport.setMonotonicTimeForTest(1000.5);
     runPendingTasks();
 
     ASSERT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
     m_scheduler->postCompositorTask(FROM_HERE, WTF::bind(&dummyTask));
 
     EXPECT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
 }
 
+TEST_F(SchedulerTest, testDidReceiveInputEvent_DoesntTriggerLowLatencyModeForLong)
+{
+    m_platformSupport.setMonotonicTimeForTest(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();
+    m_platformSupport.setMonotonicTimeForTest(1000.5);
+    runPendingTasks();
+
+    ASSERT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
+    m_scheduler->postCompositorTask(FROM_HERE, WTF::bind(&dummyTask));
+
+    EXPECT_FALSE(m_scheduler->shouldYieldForHighPriorityWork());
+}
+
 } // namespace