Use MessageLoop for CompositorTest.LocksTimeOut

ui/compositor/compositor_unittest.cc

 // Copyright 2015 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 "base/test/test_simple_task_runner.h"
+#include "base/single_thread_task_runner.h"
+#include "base/test/test_pending_task.h"
+#include "base/threading/platform_thread.h"
 #include "cc/output/begin_frame_args.h"
 #include "cc/test/begin_frame_args_test.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/test/context_factories_for_test.h"
 
 using testing::Mock;
 using testing::_;
 
 namespace ui {
 namespace {
 
 class MockCompositorBeginFrameObserver : public CompositorBeginFrameObserver {
  public:
   MOCK_METHOD1(OnSendBeginFrame, void(const cc::BeginFrameArgs&));
 };
 
+// Thread safe and slim version of base::TestSimpleTaskRunner. This is done by
+// using
+// mutex to protect pending_tasks_.

[reveman, 2015/04/14 22:42:10]

nit: fix line wrapping

+class TestThreadSafeSimpleTaskRunner : public base::SingleThreadTaskRunner {
+ public:
+  TestThreadSafeSimpleTaskRunner()
+      : thread_id_(base::PlatformThread::CurrentId()) {}
+
+  // SingleThreadTaskRunner implementation.
+  bool PostDelayedTask(const tracked_objects::Location& from_here,
+                       const base::Closure& task,
+                       base::TimeDelta delay) override {
+    base::AutoLock lock(pending_tasks_lock_);
+    pending_tasks_.push_back(
+        base::TestPendingTask(from_here, task, base::TimeTicks(), delay,
+                              base::TestPendingTask::NESTABLE));
+    return true;
+  }
+
+  bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
+                                  const base::Closure& task,
+                                  base::TimeDelta delay) override {
+    base::AutoLock lock(pending_tasks_lock_);
+    pending_tasks_.push_back(
+        base::TestPendingTask(from_here, task, base::TimeTicks(), delay,
+                              base::TestPendingTask::NON_NESTABLE));
+    return true;
+  }
+
+  bool RunsTasksOnCurrentThread() const override {
+    return thread_id_ == base::PlatformThread::CurrentId();
+  }
+
+  // Runs each current pending task in order and clears the queue.
+  // Any tasks posted by the tasks are not run.
+  bool RunPendingTasks() {
+    std::deque<base::TestPendingTask> tasks_to_run;
+    {
+      base::AutoLock lock(pending_tasks_lock_);
+      tasks_to_run.swap(pending_tasks_);
+
+      if (tasks_to_run.empty())

[reveman, 2015/04/14 22:42:10]

nit: you can remove this and just "return !tasks_to_run.empty()" instead of
"return true" below instead.

+        return false;
+    }
+
+    for (std::deque<base::TestPendingTask>::iterator it = tasks_to_run.begin();
+         it != tasks_to_run.end(); ++it) {
+      it->task.Run();
+    }
+
+    return true;
+  }
+
+  // Runs pending tasks until the queue is empty.
+  void RunUntilIdle() {
+    while (RunPendingTasks())
+      continue;
+  }
+
+ protected:
+  ~TestThreadSafeSimpleTaskRunner() override {}
+
+  base::PlatformThreadId thread_id_;
+  std::deque<base::TestPendingTask> pending_tasks_;
+  // The lock that protects access to |pending_tasks_|.
+  base::Lock pending_tasks_lock_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestThreadSafeSimpleTaskRunner);
+};
+
 // Test fixture for tests that require a ui::Compositor with a real task
 // runner.
 class CompositorTest : public testing::Test {
  public:
   CompositorTest() {}
   ~CompositorTest() override {}
 
   void SetUp() override {
-    task_runner_ = new base::TestSimpleTaskRunner;
+    task_runner_ = new TestThreadSafeSimpleTaskRunner;
 
     ui::ContextFactory* context_factory =
         ui::InitializeContextFactoryForTests(false);
 
     compositor_.reset(new ui::Compositor(gfx::kNullAcceleratedWidget,
                                          context_factory, task_runner_));
   }
   void TearDown() override {
     compositor_.reset();
     ui::TerminateContextFactoryForTests();
   }
 
  protected:
-  base::TestSimpleTaskRunner* task_runner() { return task_runner_.get(); }
+  TestThreadSafeSimpleTaskRunner* task_runner() { return task_runner_.get(); }
   ui::Compositor* compositor() { return compositor_.get(); }
 
  private:
-  scoped_refptr<base::TestSimpleTaskRunner> task_runner_;
+  scoped_refptr<TestThreadSafeSimpleTaskRunner> task_runner_;
   scoped_ptr<ui::Compositor> compositor_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositorTest);
 };
 
 }  // namespace
 
 TEST_F(CompositorTest, LocksTimeOut) {
   scoped_refptr<ui::CompositorLock> lock;
 
@@ skipping 46 matching lines @@
   EXPECT_CALL(test_observer2, OnSendBeginFrame(_)).Times(0);
   compositor()->RemoveBeginFrameObserver(&test_observer);
   compositor()->RemoveBeginFrameObserver(&test_observer2);
   compositor()->AddBeginFrameObserver(&test_observer2);
   Mock::VerifyAndClearExpectations(&test_observer2);
 
   compositor()->RemoveBeginFrameObserver(&test_observer2);
 }
 
 }  // namespace ui