Add hooks for GL_EXT_debug_marker in gpu

src/gpu/gl/iOS/GrGLCreateNativeInterface_iOS.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "gl/GrGLInterface.h"
@@ skipping 126 matching lines @@
     functions->fRenderbufferStorageMultisample = glRenderbufferStorageMultisampleAPPLE;
     functions->fResolveMultisampleFramebuffer = glResolveMultisampleFramebufferAPPLE;
 #endif
 
 #if GL_OES_vertex_array_object
     functions->fBindVertexArray = glBindVertexArrayOES;
     functions->fDeleteVertexArrays = glDeleteVertexArraysOES;
     functions->fGenVertexArrays = glGenVertexArraysOES;
 #endif
 
+    if (extensions.has("GL_EXT_debug_marker")) {
+      functions->fInsertEventMarker = glInsertEventMarkerEXT;

[bsalomon, 2014/02/20 22:14:13]

I think we either have to dynamically load the function addrs or guard this with
#if GL_EXT_... or else these symbols won't be found.

+      functions->fPushGroupMarker = glPushGroupMarkerEXT;
+      functions->fPopGroupMarker = glPopGropuMarkerEXT;
+    }
     interface->fStandard = kGLES_GrGLStandard;
     interface->fExtensions.init(kGLES_GrGLStandard, glGetString, NULL, glGetIntegerv);
 
     return interface;
 }