experiment with -Wimplicit-fallthrough

gpu/command_buffer/service/gles2_cmd_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 "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 4004 matching lines @@
                                            texture_manager(),
                                            attachments[i],
                                            false);
     } else {
       switch (attachments[i]) {
         case GL_COLOR_EXT:
           backbuffer_needs_clear_bits_ |= GL_COLOR_BUFFER_BIT;
           break;
         case GL_DEPTH_EXT:
           backbuffer_needs_clear_bits_ |= GL_DEPTH_BUFFER_BIT;
+          break;  // FIXME is this right
         case GL_STENCIL_EXT:
           backbuffer_needs_clear_bits_ |= GL_STENCIL_BUFFER_BIT;
           break;
         default:
           NOTREACHED();
           break;
       }
     }
   }
 
@@ skipping 1023 matching lines @@
       *params = renderbuffer->height();
       break;
     case GL_RENDERBUFFER_SAMPLES_EXT:
       if (features().use_img_for_multisampled_render_to_texture) {
         glGetRenderbufferParameterivEXT(target, GL_RENDERBUFFER_SAMPLES_IMG,
             params);
       } else {
         glGetRenderbufferParameterivEXT(target, GL_RENDERBUFFER_SAMPLES_EXT,
             params);
       }
+      break;  // FIXME is this right
     default:
       glGetRenderbufferParameterivEXT(target, pname, params);
       break;
   }
 }
 
 void GLES2DecoderImpl::DoBlitFramebufferCHROMIUM(
     GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
     GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
     GLbitfield mask, GLenum filter) {
@@ skipping 5563 matching lines @@
   DoDidUseTexImageIfNeeded(texture, texture->target());
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu