experiment with -Wimplicit-fallthrough

content/common/gpu/client/gl_helper_scaling.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/common/gpu/client/gl_helper_scaling.h"
 
 #include <deque>
 #include <string>
 #include <vector>
 
@@ skipping 349 matching lines @@
         if (current_shader == SHADER_BILINEAR2 && x_ops->size() >= 2) {
           // 2y + 2x passes
           x_passes = 2;
           current_shader = SHADER_BILINEAR2X2;
         } else if (current_shader == SHADER_BILINEAR) {
           // 1y + Nx passes
           scale_x = true;
           switch (x_ops->size()) {
             case 0:
               NOTREACHED();
+              FALLTHROUGH_INTENDED;
             case 1:
               if (x_ops->front().scale_factor == 3) {
                 current_shader = SHADER_BILINEAR3;
               }
               x_passes = 1;
               break;
             case 2:
               x_passes = 2;
               current_shader = SHADER_BILINEAR2;
               break;
@@ skipping 578 matching lines @@
                       static_cast<float>(dst_size.width()),
                       static_cast<float>(dst_size.height()));
 
   context_->uniform2f(scaling_vector_location_,
                       scale_x ? 1.0 : 0.0,
                       scale_x ? 0.0 : 1.0);
   context_->uniform4fv(color_weights_location_, 1, color_weights);
 }
 
 }  // namespace content