gpu: Add a new extension CHROMIUM_deschedule.

gpu/command_buffer/service/command_executor.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/command_executor.h"
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 42 matching lines @@
   if (decoder_)
     decoder_->BeginDecoding();
   while (!parser_->IsEmpty()) {
     if (IsPreempted())
       break;
 
     DCHECK(scheduled());
 
     error = parser_->ProcessCommands(CommandParser::kParseCommandsSlice);
 
-    if (error == error::kDeferCommandUntilLater) {
+    if (error == error::kDeferCommandUntilLater ||
+        error == error::kDeferLaterCommands) {

[piman, 2016/05/31 22:39:21]

I think we want to update the Get offset (since we did execute the command and
don't want to get back to it), and possibly call the command_processed_callback_
(so that the watchdog gets pinged). How about just following through the rest,
we should exit the loop on l.83 ?

[erikchen, 2016/05/31 22:52:01]

Good point. Done.

       DCHECK(!scheduled());
       break;
     }
 
     // TODO(piman): various classes duplicate various pieces of state, leading
     // to needlessly complex update logic. It should be possible to simply
     // share the state across all of them.
     command_buffer_->SetGetOffset(static_cast<int32_t>(parser_->get()));
 
     if (error::IsError(error)) {
@@ skipping 97 matching lines @@
   return (decoder_ && decoder_->HasMoreIdleWork());
 }
 
 void CommandExecutor::PerformIdleWork() {
   if (!decoder_)
     return;
   decoder_->PerformIdleWork();
 }
 
 }  // namespace gpu