Add ToString function for media::VideoCaptureFormat

media/video/capture/mac/video_capture_device_avfoundation_mac.mm

 // 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.
 
 #import "media/video/capture/mac/video_capture_device_avfoundation_mac.h"
 
 #import <CoreVideo/CoreVideo.h>
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
@@ skipping 63 matching lines @@
         CoreMediaGlue::CMVideoFormatDescriptionGetDimensions(
             [format formatDescription]);
 
   for (CrAVFrameRateRange* frameRate in
            [format videoSupportedFrameRateRanges]) {
       media::VideoCaptureFormat format(
           gfx::Size(dimensions.width, dimensions.height),
           frameRate.maxFrameRate,
           pixelFormat);
       formats->push_back(format);
-      DVLOG(2) << name.name() << " resolution: "
-               << format.frame_size.ToString() << ", fps: "
-               << format.frame_rate << ", pixel format: "
-               << format.pixel_format;
+      DVLOG(2) << name.name() << " " << format.ToString();
     }
   }
 
 }
 
 #pragma mark Public methods
 
 - (id)initWithFrameReceiver:(media::VideoCaptureDeviceMac*)frameReceiver {
   if ((self = [super init])) {
     DCHECK(main_thread_checker_.CalledOnValidThread());
@@ skipping 192 matching lines @@
 }
 
 - (void)sendErrorString:(NSString*)error {
   DLOG(ERROR) << [error UTF8String];
   base::AutoLock lock(lock_);
   if (frameReceiver_)
     frameReceiver_->ReceiveError([error UTF8String]);
 }
 
 @end