Remove unused thread.h include in trace_event_impl.h and fix IWUU.

cc/raster/raster_buffer_provider_unittest.cc

 // Copyright 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.
 
 #include "cc/raster/raster_buffer_provider.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
 #include <limits>
 #include <vector>
 
 #include "base/cancelable_callback.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
+#include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "cc/base/unique_notifier.h"
 #include "cc/raster/bitmap_raster_buffer_provider.h"
 #include "cc/raster/gpu_raster_buffer_provider.h"
 #include "cc/raster/one_copy_raster_buffer_provider.h"
 #include "cc/raster/synchronous_task_graph_runner.h"
 #include "cc/raster/zero_copy_raster_buffer_provider.h"
 #include "cc/resources/platform_color.h"
 #include "cc/resources/resource_pool.h"
@@ skipping 355 matching lines @@
 
 INSTANTIATE_TEST_CASE_P(RasterBufferProviderTests,
                         RasterBufferProviderTest,
                         ::testing::Values(RASTER_BUFFER_PROVIDER_TYPE_ZERO_COPY,
                                           RASTER_BUFFER_PROVIDER_TYPE_ONE_COPY,
                                           RASTER_BUFFER_PROVIDER_TYPE_GPU,
                                           RASTER_BUFFER_PROVIDER_TYPE_BITMAP));
 
 }  // namespace
 }  // namespace cc