Make command buffer commands and immediate data volatile

gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc

 // Copyright (c) 2016 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_passthrough.h"
 
 namespace gpu {
 namespace gles2 {
 
 GLES2DecoderPassthroughImpl::GLES2DecoderPassthroughImpl(ContextGroup* group)
     : commands_to_process_(0),
       debug_marker_manager_(),
       logger_(&debug_marker_manager_),
       surface_(),
       context_(),
       group_(group),
       feature_info_(group->feature_info()) {
   DCHECK(group);
 }
 
 GLES2DecoderPassthroughImpl::~GLES2DecoderPassthroughImpl() {}
 
 GLES2Decoder::Error GLES2DecoderPassthroughImpl::DoCommands(
     unsigned int num_commands,
-    const void* buffer,
+    const volatile void* buffer,
     int num_entries,
     int* entries_processed) {
   commands_to_process_ = num_commands;
   error::Error result = error::kNoError;
-  const CommandBufferEntry* cmd_data =
-      static_cast<const CommandBufferEntry*>(buffer);
+  const volatile CommandBufferEntry* cmd_data =
+      static_cast<const volatile CommandBufferEntry*>(buffer);
   int process_pos = 0;
   unsigned int command = 0;
 
   while (process_pos < num_entries && result == error::kNoError &&
          commands_to_process_--) {
     const unsigned int size = cmd_data->value_header.size;
     command = cmd_data->value_header.command;
 
     if (size == 0) {
       result = error::kInvalidSize;
@@ skipping 340 matching lines @@
   }, /* NOLINT */
 
 const GLES2DecoderPassthroughImpl::CommandInfo
     GLES2DecoderPassthroughImpl::command_info[] = {
         GLES2_COMMAND_LIST(GLES2_CMD_OP)};
 
 #undef GLES2_CMD_OP
 
 }  // namespace gles2
 }  // namespace gpu