media/gpu/chromeos: include media_log.h in video decoder factory's header

The video decoder factory object needs to know the size of MediaLog in
order to be instantiated. Include the header containing its definition
so users don't have to do it.

BUG=None
TEST=Chromium builds.

Change-Id: Idce313f58565f0b71788453d443910b5cc0a3647
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2503912
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Fritz Koenig <frkoenig@chromium.org>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821983}

media/gpu/chromeos/chromeos_video_decoder_factory.cc

@@ -7,7 +7,6 @@
 #include <utility>
 
 #include "base/sequenced_task_runner.h"
-#include "media/base/media_log.h"
 #include "media/base/video_decoder.h"
 #include "media/gpu/buildflags.h"
 #include "media/gpu/chromeos/mailbox_video_frame_converter.h"

media/gpu/chromeos/chromeos_video_decoder_factory.h

@@ -8,6 +8,7 @@
 #include <memory>
 
 #include "base/memory/scoped_refptr.h"
+#include "media/base/media_log.h"
 #include "media/gpu/media_gpu_export.h"
 #include "media/video/supported_video_decoder_config.h"
 
@@ -22,7 +23,6 @@ class GpuDriverBugWorkarounds;
 namespace media {
 
 class DmabufVideoFramePool;
-class MediaLog;
 class VideoDecoder;
 class VideoFrameConverter;