Fix scons build of gpu command buffer.

gpu/command_buffer/client/gles2_implementation.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.
 
 // A class to emulate GLES2 over command buffers.
 
 #include "../client/gles2_implementation.h"
 
 #include <algorithm>
 #include <map>
@@ skipping 410 matching lines @@
       error_bits_(0),
       debug_(false),
       use_count_(0),
       current_query_(NULL),
       error_message_callback_(NULL),
       context_lost_(false) {
   GPU_DCHECK(helper);
   GPU_DCHECK(transfer_buffer);
 
   char temp[128];
-  sprintf(temp, "%p", this);
+  sprintf(temp, "%p", static_cast<void*>(this));
   this_in_hex_ = std::string(temp);
 
   GPU_CLIENT_LOG_CODE_BLOCK({
     debug_ = CommandLine::ForCurrentProcess()->HasSwitch(
         switches::kEnableGPUClientLogging);
   });
 
   share_group_ = (share_group ? share_group : new ShareGroup(
       share_resources, bind_generates_resource));
 
@@ skipping 2952 matching lines @@
 
 void GLES2Implementation::PopGroupMarkerEXT() {
   GPU_CLIENT_SINGLE_THREAD_CHECK();
   GPU_CLIENT_LOG("[" << GetLogPrefix() << "] glPopGroupMarkerEXT()");
   helper_->PopGroupMarkerEXT();
   debug_marker_manager_.PopGroup();
 }
 
 }  // namespace gles2
 }  // namespace gpu