Fix uninitialized media::VideoRotation variable issue

content/renderer/media/webmediaplayer_ms.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 "content/renderer/media/webmediaplayer_ms.h"
 
 #include <stddef.h>
 #include <limits>
 #include <string>
 #include <utility>
@@ skipping 66 matching lines @@
       TRACE_EVENT1("webrtc", "WebMediaPlayerMS::OnFrameAvailable",
                    "Ideal Render Instant", render_time.ToInternalValue());
     } else {
       TRACE_EVENT0("webrtc", "WebMediaPlayerMS::OnFrameAvailable");
     }
     const bool is_opaque = media::IsOpaque(frame->format());
 
     if (!received_first_frame_) {
       received_first_frame_ = true;
       last_frame_opaque_ = is_opaque;
-      media::VideoRotation video_rotation;
+      media::VideoRotation video_rotation = media::VIDEO_ROTATION_0;
       ignore_result(frame->metadata()->GetRotation(
           media::VideoFrameMetadata::ROTATION, &video_rotation));
       main_task_runner_->PostTask(
           FROM_HERE, base::Bind(&WebMediaPlayerMS::OnFirstFrameReceived,
                                 player_, video_rotation, is_opaque));
     }
 
     if (last_frame_opaque_ != is_opaque) {
       last_frame_opaque_ = is_opaque;
       main_task_runner_->PostTask(
@@ skipping 557 matching lines @@
 void WebMediaPlayerMS::ResetCanvasCache() {
   DCHECK(thread_checker_.CalledOnValidThread());
   video_renderer_.ResetCache();
 }
 
 void WebMediaPlayerMS::TriggerResize() {
   get_client()->sizeChanged();
 }
 
 }  // namespace content