Reland of gpu: GPU service scheduler.

gpu/command_buffer/service/gles2_cmd_decoder.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/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 16012 matching lines @@
 error::Error GLES2DecoderImpl::HandleInsertFenceSyncCHROMIUM(
     uint32_t immediate_data_size,
     const volatile void* cmd_data) {
   const volatile gles2::cmds::InsertFenceSyncCHROMIUM& c =
       *static_cast<const volatile gles2::cmds::InsertFenceSyncCHROMIUM*>(
           cmd_data);
 
   const uint64_t release_count = c.release_count();
   if (!fence_sync_release_callback_.is_null())
     fence_sync_release_callback_.Run(release_count);
+  // Exit inner command processing loop so that we check the scheduling state
+  // and yield if necessary as we may have unblocked a higher priority context.
+  ExitCommandProcessingEarly();
   return error::kNoError;
 }
 
 error::Error GLES2DecoderImpl::HandleWaitSyncTokenCHROMIUM(
     uint32_t immediate_data_size,
     const volatile void* cmd_data) {
   const volatile gles2::cmds::WaitSyncTokenCHROMIUM& c =
       *static_cast<const volatile gles2::cmds::WaitSyncTokenCHROMIUM*>(
           cmd_data);
 
@@ skipping 3594 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu