Introduce a basic 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 "public/platform/Platform.h"
+
+#include <gtest/gtest.h>
+
+using WebCore::Scheduler;
+
+namespace {
+
+class TestMainThread : public blink::WebThread {
+public:
+    // blink::WebThread implementation.
+    virtual void postTask(Task* task) OVERRIDE
+    {
+        m_pendingTasks.append(adoptPtr(task));
+    }
+
+    virtual void postDelayedTask(Task* task, long long delayMs) OVERRIDE
+    {
+        ASSERT_NOT_REACHED();
+    }
+
+    virtual bool isCurrentThread() const OVERRIDE
+    {
+        return true;
+    }
+
+    virtual void enterRunLoop() OVERRIDE
+    {
+        ASSERT_NOT_REACHED();
+    }
+
+    virtual void exitRunLoop() OVERRIDE
+    {
+        ASSERT_NOT_REACHED();
+    }
+
+    void runPendingTasks()
+    {
+        while (!m_pendingTasks.isEmpty())
+            m_pendingTasks.takeFirst()->run();
+    }
+
+private:
+    WTF::Deque<OwnPtr<Task> > m_pendingTasks;
+};
+
+class SchedulerTestingPlatformSupport : WebCore::TestingPlatformSupport {
+public:
+    SchedulerTestingPlatformSupport()
+        : TestingPlatformSupport(TestingPlatformSupport::Config())
+        , m_sharedTimerFunction(nullptr)
+        , m_sharedTimerRunning(false)
+        , m_sharedTimerFireInterval(0)
+    {
+    }
+
+    // blink::Platform implementation.
+    virtual blink::WebThread* currentThread() OVERRIDE
+    {
+        return &m_mainThread;
+    }
+
+    virtual void setSharedTimerFiredFunction(SharedTimerFunction timerFunction) OVERRIDE
+    {
+        m_sharedTimerFunction = timerFunction;
+    }
+
+    virtual void setSharedTimerFireInterval(double)
+    {
+        m_sharedTimerFireInterval = 0;
+        m_sharedTimerRunning = true;
+    }
+
+    virtual void stopSharedTimer()
+    {
+        m_sharedTimerRunning = false;
+    }
+
+    void runPendingTasks()
+    {
+        m_mainThread.runPendingTasks();
+    }
+
+    bool sharedTimerRunning() const
+    {
+        return m_sharedTimerRunning;
+    }
+
+    double sharedTimerFireInterval() const
+    {
+        return m_sharedTimerFireInterval;
+    }
+
+    void triggerSharedTimer()
+    {
+        m_sharedTimerFunction();
+    }
+
+private:
+    TestMainThread m_mainThread;
+    SharedTimerFunction m_sharedTimerFunction;
+    bool m_sharedTimerRunning;
+    double m_sharedTimerFireInterval;
+};
+
+class SchedulerTest : public testing::Test {
+public:
+    SchedulerTest()
+    {
+        Scheduler::initializeOnMainThread();
+        m_scheduler = Scheduler::shared();
+    }
+
+    ~SchedulerTest()
+    {
+        Scheduler::shutdown();
+    }
+
+    void runPendingTasks()
+    {
+        m_platformSupport.runPendingTasks();
+    }
+
+protected:
+    SchedulerTestingPlatformSupport m_platformSupport;
+    Scheduler* m_scheduler;
+};
+
+void orderedTestTask(int value, int* result)
+{
+    *result = (*result << 4) | value;
+}
+
+void unorderedTestTask(int value, int* result)
+{
+    *result += value;
+}
+
+TEST_F(SchedulerTest, TestPostTask)
+{
+    int result = 0;
+    m_scheduler->postTask(bind(&orderedTestTask, 1, &result));
+    m_scheduler->postTask(bind(&orderedTestTask, 2, &result));
+    m_scheduler->postTask(bind(&orderedTestTask, 3, &result));
+    m_scheduler->postTask(bind(&orderedTestTask, 4, &result));
+    runPendingTasks();
+    EXPECT_EQ(0x1234, result);
+}
+
+TEST_F(SchedulerTest, TestPostMixedTaskTypes)
+{
+    int result = 0;
+    m_scheduler->postTask(bind(&unorderedTestTask, 1, &result));
+    m_scheduler->postInputTask(bind(&unorderedTestTask, 1, &result));
+    m_scheduler->postCompositorTask(bind(&unorderedTestTask, 1, &result));
+    m_scheduler->postTask(bind(&unorderedTestTask, 1, &result));
+    runPendingTasks();
+    EXPECT_EQ(4, result);
+}
+
+int s_sharedTimerTickCount;
+void sharedTimerFunction()
+{
+    s_sharedTimerTickCount++;
+}
+
+TEST_F(SchedulerTest, TestSharedTimer)
+{
+    s_sharedTimerTickCount = 0;
+    m_scheduler->setSharedTimerFiredFunction(&sharedTimerFunction);
+    EXPECT_FALSE(m_platformSupport.sharedTimerRunning());
+    m_scheduler->setSharedTimerFireInterval(0);
+    EXPECT_TRUE(m_platformSupport.sharedTimerRunning());
+
+    m_platformSupport.triggerSharedTimer();
+    EXPECT_EQ(1, s_sharedTimerTickCount);
+
+    m_scheduler->stopSharedTimer();
+    EXPECT_FALSE(m_platformSupport.sharedTimerRunning());
+
+    m_scheduler->setSharedTimerFiredFunction(nullptr);
+    EXPECT_FALSE(m_platformSupport.sharedTimerRunning());
+}
+
+} // namespace