gpu: Allow waiting on sync tokens without sync token client.

gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.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"
 
 #include "base/strings/string_number_conversions.h"
 #include "ui/gl/gl_version_info.h"
 
 namespace gpu {
@@ skipping 3079 matching lines @@
     GLuint64 release_count) {
   if (!fence_sync_release_callback_.is_null())
     fence_sync_release_callback_.Run(release_count);
   return error::kNoError;
 }
 
 error::Error GLES2DecoderPassthroughImpl::DoWaitSyncTokenCHROMIUM(
     CommandBufferNamespace namespace_id,
     CommandBufferId command_buffer_id,
     GLuint64 release_count) {
-  if (wait_fence_sync_callback_.is_null()) {
+  if (wait_sync_token_callback_.is_null()) {
     return error::kNoError;
   }
-  return wait_fence_sync_callback_.Run(namespace_id, command_buffer_id,
-                                       release_count)
-             ? error::kNoError
-             : error::kDeferCommandUntilLater;
+  SyncToken sync_token(namespace_id, 0, command_buffer_id, release_count);
+  return wait_sync_token_callback_.Run(sync_token)
+             ? error::kDeferCommandUntilLater
+             : error::kNoError;
 }
 
 error::Error GLES2DecoderPassthroughImpl::DoDrawBuffersEXT(
     GLsizei count,
     const volatile GLenum* bufs) {
   // Validate that count is non-negative before allocating a vector
   if (count < 0) {
     InsertError(GL_INVALID_VALUE, "count cannot be negative.");
     return error::kNoError;
   }
@@ skipping 346 matching lines @@
     GLuint texture,
     GLboolean promotion_hint,
     GLint display_x,
     GLint display_y) {
   NOTIMPLEMENTED();
   return error::kNoError;
 }
 
 }  // namespace gles2
 }  // namespace gpu