Type conversion fixes, gpu/ edition.

gpu/command_buffer/service/program_cache.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/program_cache.h"
 
 #include <string>
 #include "base/memory/scoped_ptr.h"
 #include "gpu/command_buffer/service/shader_manager.h"
 
@@ skipping 105 matching lines @@
     size_t current_pos = shader0_size + shader1_size;
     std::map<std::string, GLint>::const_iterator it;
     for (it = bind_attrib_location_map->begin();
          it != bind_attrib_location_map->end();
          ++it) {
       const size_t name_size = it->first.length();
       memcpy(&buffer.get()[current_pos], it->first.c_str(), name_size);
       current_pos += name_size;
       const GLint value = it->second;
       buffer[current_pos++] = value >> 24;
-      buffer[current_pos++] = value >> 16;
-      buffer[current_pos++] = value >> 8;
-      buffer[current_pos++] = value;
+      buffer[current_pos++] = static_cast<unsigned char>(value >> 16);
+      buffer[current_pos++] = static_cast<unsigned char>(value >> 8);
+      buffer[current_pos++] = static_cast<unsigned char>(value);
     }
   }
   base::SHA1HashBytes(buffer.get(),
                       total_size, reinterpret_cast<unsigned char*>(result));
 }
 
 }  // namespace gles2
 }  // namespace gpu