experiment with -Wimplicit-fallthrough

content/renderer/pepper/pepper_platform_context_3d.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 "content/renderer/pepper/pepper_platform_context_3d.h"
 
 #include "base/bind.h"
 #include "content/common/gpu/client/context_provider_command_buffer.h"
 #include "content/common/gpu/client/gpu_channel_host.h"
 #include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
@@ skipping 55 matching lines @@
         case PP_GRAPHICS3DATTRIB_HEIGHT:
           surface_size.set_height(attr[1]);
           break;
         case PP_GRAPHICS3DATTRIB_GPU_PREFERENCE:
           gpu_preference =
               (attr[1] == PP_GRAPHICS3DATTRIB_GPU_PREFERENCE_LOW_POWER) ?
                   gfx::PreferIntegratedGpu : gfx::PreferDiscreteGpu;
           break;
         case PP_GRAPHICS3DATTRIB_ALPHA_SIZE:
           has_alpha_ = attr[1] > 0;
-        // fall-through
+          FALLTHROUGH_INTENDED;
         default:
           attribs.push_back(attr[0]);
           attribs.push_back(attr[1]);
           break;
       }
     }
     attribs.push_back(PP_GRAPHICS3DATTRIB_NONE);
   }
 
   CommandBufferProxyImpl* share_buffer = NULL;
@@ skipping 74 matching lines @@
 }
 
 void PlatformContext3D::OnConsoleMessage(const std::string& msg, int id) {
   DCHECK(command_buffer_);
 
   if (!console_message_callback_.is_null())
     console_message_callback_.Run(msg, id);
 }
 
 }  // namespace content