Make WaitSyncPoint go through command buffers.

gpu/GLES2/gl2extchromium.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 contains Chromium-specific GLES2 extensions declarations.
 
 #ifndef GPU_GLES2_GL2EXTCHROMIUM_H_
 #define GPU_GLES2_GL2EXTCHROMIUM_H_
 
 #include <GLES2/gl2.h>
@@ skipping 425 matching lines @@
    const GLenum* pnames, GLuint count, GLint* results, GLsizeiptr size);
 typedef void (GL_APIENTRYP PFNGLGETPROGRAMINFOCHROMIUMPROC) (
    GLuint program, GLsizei bufsize, GLsizei* size, void* info);
 #endif  /* GL_CHROMIUM_get_multiple */
 
 /* GL_CHROMIUM_front_buffer_cached */
 #ifndef GL_CHROMIUM_front_buffer_cached
 #define GL_CHROMIUM_front_buffer_cached 1
 #endif  /* GL_CHROMIUM_front_buffer_cached */
 
+/* GL_CHROMIUM_sync_point */
+#ifndef GL_CHROMIUM_sync_point
+#define GL_CHROMIUM_sync_point 1
+#ifdef GL_GLEXT_PROTOTYPES
+GL_APICALL GLuint GL_APIENTRY glInsertSyncPointCHROMIUM();
+GL_APICALL void GL_APIENTRY glWaitSyncPointCHROMIUM(GLuint sync_point);
+#endif
+typedef GLuint (GL_APIENTRYP PFNGLINSERTSYNCPOINTCHROMIUMPROC) ();
+typedef void (GL_APIENTRYP PFNGLWAITSYNCPOINTCHROMIUMPROC) (GLuint sync_point);
+#endif  /* GL_CHROMIUM_sync_point */
+
 #ifdef __cplusplus
 }
 #endif
 
 #endif  // GPU_GLES2_GL2EXTCHROMIUM_H_