Update from https://crrev.com/312600

gpu/command_buffer/common/gles2_cmd_format.h

 // 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.
 
 // This file defines the GLES2 command buffer commands.
 
 #ifndef GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_H_
 #define GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_H_
 
 
@@ skipping 24 matching lines @@
 typedef unsigned char GLubyte;
 typedef unsigned short GLushort;
 typedef unsigned long GLulong;
 typedef float GLfloat;
 typedef float GLclampf;
 typedef double GLdouble;
 typedef double GLclampd;
 typedef void GLvoid;
 typedef khronos_intptr_t GLintptr;
 typedef khronos_ssize_t  GLsizeiptr;
+typedef struct __GLsync *GLsync;
 
 namespace gpu {
 namespace gles2 {
 
 // Command buffer is GPU_COMMAND_BUFFER_ENTRY_ALIGNMENT byte aligned.
 #pragma pack(push, GPU_COMMAND_BUFFER_ENTRY_ALIGNMENT)
 
 namespace id_namespaces {
 
 // These are used when contexts share resources.
 enum IdNamespaces {
   kBuffers,
   kFramebuffers,
   kProgramsAndShaders,
   kRenderbuffers,
   kTextures,
   kQueries,
   kVertexArrays,
   kValuebuffers,
   kSamplers,
   kTransformFeedbacks,
+  kSyncs,
   kNumIdNamespaces
 };
 
 // These numbers must not change
 static_assert(kBuffers == 0, "kBuffers should equal 0");
 static_assert(kFramebuffers == 1, "kFramebuffers should equal 1");
 static_assert(kProgramsAndShaders == 2, "kProgramsAndShaders should equal 2");
 static_assert(kRenderbuffers == 3, "kRenderbuffers should equal 3");
 static_assert(kTextures == 4, "kTextures should equal 4");
 
@@ skipping 199 matching lines @@
     "offset of CreateAndConsumeTextureCHROMIUMImmediate.client_id should be 8");
 
 
 #pragma pack(pop)
 
 }  // namespace cmd
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_FORMAT_H_