experiment with -Wimplicit-fallthrough

media/filters/gpu_video_decoder.cc

 // Copyright (c) 2012 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 "media/filters/gpu_video_decoder.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 223 matching lines @@
     return;
   }
 
   switch (state_) {
     case kDecoderDrained:
       if (!ready_video_frames_.empty()) {
         EnqueueFrameAndTriggerFrameDelivery(NULL);
         return;
       }
       state_ = kNormal;
-      // Fall-through.
+      FALLTHROUGH_INTENDED;
     case kNormal:
       break;
     case kDrainingDecoder:
       DCHECK(buffer->end_of_stream());
       // Do nothing.  Will be satisfied either by a PictureReady or
       // NotifyFlushDone below.
       return;
     case kError:
       NOTREACHED();
       return;
@@ skipping 362 matching lines @@
 
   state_ = kError;
 
   if (!pending_decode_cb_.is_null()) {
     base::ResetAndReturn(&pending_decode_cb_).Run(kDecodeError, NULL);
     return;
   }
 }
 
 }  // namespace media