gpu: Add a new extension CHROMIUM_deschedule.

gpu/command_buffer/service/command_executor.cc

Index: gpu/command_buffer/service/command_executor.cc
diff --git a/gpu/command_buffer/service/command_executor.cc b/gpu/command_buffer/service/command_executor.cc
index f541a537f80988bd0f5fef37e08d4b6bcaa41418..4111798c88820723e6722d8e6c03c34430afbb87 100644
--- a/gpu/command_buffer/service/command_executor.cc
+++ b/gpu/command_buffer/service/command_executor.cc
@@ -60,7 +60,8 @@ void CommandExecutor::PutChanged() {
 
     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;
     }