Implement idle task scheduling.

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 221 matching lines @@
 void orderedTestTask(int value, int* result)
 {
     *result = (*result << 4) | value;
 }
 
 void unorderedTestTask(int value, int* result)
 {
     *result += value;
 }
 
-void idleTestTask(int value, int* result, double allottedTime)
+void idleTestTask(bool* taskRun, double expectedDeadline, double deadlineSeconds)
 {
-    *result += value;
+    EXPECT_EQ(false, *taskRun);
+    EXPECT_EQ(expectedDeadline, deadlineSeconds);
+    *taskRun = true;
 }
 
 TEST_F(SchedulerTest, TestPostTask)
 {
     int result = 0;
     m_scheduler->postTask(FROM_HERE, WTF::bind(&orderedTestTask, 1, &result));
     m_scheduler->postTask(FROM_HERE, WTF::bind(&orderedTestTask, 2, &result));
     m_scheduler->postTask(FROM_HERE, WTF::bind(&orderedTestTask, 3, &result));
     m_scheduler->postTask(FROM_HERE, WTF::bind(&orderedTestTask, 4, &result));
     runPendingTasks();
@@ skipping 31 matching lines @@
 
     m_scheduler->stopSharedTimer();
     EXPECT_FALSE(m_platformSupport.sharedTimerRunning());
 
     m_scheduler->setSharedTimerFiredFunction(nullptr);
     EXPECT_FALSE(m_platformSupport.sharedTimerRunning());
 }
 
 TEST_F(SchedulerTest, TestIdleTask)
 {
-    // TODO: Check task allottedTime when implemented in the scheduler.
-    int result = 0;
-    m_scheduler->postIdleTask(FROM_HERE, WTF::bind<double>(&idleTestTask, 1, &result));
-    m_scheduler->postIdleTask(FROM_HERE, WTF::bind<double>(&idleTestTask, 1, &result));
-    m_scheduler->postIdleTask(FROM_HERE, WTF::bind<double>(&idleTestTask, 1, &result));
-    m_scheduler->postIdleTask(FROM_HERE, WTF::bind<double>(&idleTestTask, 1, &result));
+    bool taskRun = false;
+    double firstDeadline = 1.1;
+    double secondDeadline = 2.3;
+    m_platformSupport.setMonotonicTimeForTest(0.1);
+
+    m_scheduler->postIdleTask(FROM_HERE, WTF::bind<double>(&idleTestTask, &taskRun, secondDeadline));
+
     runPendingTasks();
-    EXPECT_EQ(4, result);
+    EXPECT_FALSE(taskRun); // Shouldn't run yet as no willBeginFrame.
+
+    m_scheduler->willBeginFrame(firstDeadline);
+    runPendingTasks();
+    EXPECT_FALSE(taskRun); // Shouldn't run yet as no didCommitFrameToCompositor.
+
+    m_platformSupport.setMonotonicTimeForTest(firstDeadline + 0.1);
+    m_scheduler->didCommitFrameToCompositor();
+    runPendingTasks();
+    EXPECT_FALSE(taskRun); // We missed the deadline.
+
+    m_scheduler->willBeginFrame(secondDeadline);
+    m_platformSupport.setMonotonicTimeForTest(secondDeadline - 0.1);
+    m_scheduler->didCommitFrameToCompositor();
+    runPendingTasks();
+    EXPECT_TRUE(taskRun);
 }
 
 TEST_F(SchedulerTest, TestTaskPrioritization_normalPolicy)
 {
     m_scheduler->postTask(FROM_HERE, WTF::bind(&SchedulerTest::appendToVector, this, std::string("L1")));
     m_scheduler->postTask(FROM_HERE, WTF::bind(&SchedulerTest::appendToVector, this, std::string("L2")));
     m_scheduler->postInputTask(FROM_HERE, WTF::bind(&SchedulerTest::appendToVector, this, std::string("I1")));
     m_scheduler->postCompositorTask(FROM_HERE, WTF::bind(&SchedulerTest::appendToVector, this, std::string("C1")));
     m_scheduler->postInputTask(FROM_HERE, WTF::bind(&SchedulerTest::appendToVector, this, std::string("I2")));
     m_scheduler->postCompositorTask(FROM_HERE, WTF::bind(&SchedulerTest::appendToVector, this, std::string("C2")));
@@ skipping 232 matching lines @@
     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