Ensure tests have an active task runner

content/browser/renderer_host/media/video_capture_buffer_pool_unittest.cc

 // Copyright (c) 2013 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.
 
 // Unit test for VideoCaptureBufferPool.
 
 #include "content/browser/renderer_host/media/video_capture_buffer_pool.h"
 
 #include "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
 #include "cc/test/test_context_provider.h"
 #include "cc/test/test_web_graphics_context_3d.h"
 #include "content/browser/compositor/buffer_queue.h"
 #include "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
 #include "content/browser/renderer_host/media/video_capture_controller.h"
 #include "media/base/video_frame.h"
 #include "media/base/video_util.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 127 matching lines @@
     if (buffer_id == VideoCaptureBufferPool::kInvalidId)
       return scoped_ptr<Buffer>();
     EXPECT_EQ(expected_dropped_id_, buffer_id_to_drop);
 
     scoped_ptr<VideoCaptureBufferPool::BufferHandle> buffer_handle =
         pool_->GetBufferHandle(buffer_id);
     return scoped_ptr<Buffer>(
         new Buffer(pool_, buffer_handle.Pass(), buffer_id));
   }
 
+  base::MessageLoop loop_;
   int expected_dropped_id_;
   scoped_refptr<VideoCaptureBufferPool> pool_;
 
  private:
 #if !defined(OS_ANDROID)
   scoped_ptr<StubBrowserGpuMemoryBufferManager> gpu_memory_buffer_manager_;
   scoped_ptr<MockBufferQueue> output_surface_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureBufferPoolTest);
@@ skipping 133 matching lines @@
   if (buffer4->data() != nullptr)
     memset(buffer4->data(), 0x77, buffer4->size());
   buffer4.reset();
 }
 
 INSTANTIATE_TEST_CASE_P(,
                         VideoCaptureBufferPoolTest,
                         testing::ValuesIn(kCaptureFormats));
 
 } // namespace content