Add hooks for GL_EXT_debug_markers for Skia

ui/gl/gl_bindings_skia_in_process.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 "ui/gl/gl_bindings_skia_in_process.h"
 
 #include "base/logging.h"
 #include "third_party/skia/include/gpu/gl/GrGLInterface.h"
 #include "ui/gl/gl_bindings.h"
@@ skipping 328 matching lines @@
 
 GLvoid StubGLGetTexLevelParameteriv(GLenum target, GLint level,
                                     GLenum pname, GLint* params) {
   glGetTexLevelParameteriv(target, level, pname, params);
 }
 
 GLint StubGLGetUniformLocation(GLuint program, const char* name) {
   return glGetUniformLocation(program, name);
 }
 
+GLvoid StubGLInsertEventMarker(GLsizei length, const char* marker) {
+    glInsertEventMarkerEXT(length, marker);

[piman, 2014/03/13 00:29:23]

nit: 2 space indent (same below).

[piman, 2014/03/13 00:29:23]

Note: this has different behavior than the command-buffer version.
For the in-process case, this would send the marker to GL.
For the command buffer case, this would be handled at the command-buffer level,
fed to about:tracing.

This is not necessarily a problem, just making sure we have the right
expectations.

+}
+
 GLvoid StubGLLineWidth(GLfloat width) {
   glLineWidth(width);
 }
 
 GLvoid StubGLLinkProgram(GLuint program) {
   glLinkProgram(program);
 }
 
 void* StubGLMapBuffer(GLenum target, GLenum access) {
   return glMapBuffer(target, access);
 }
 
 GLvoid StubGLPixelStorei(GLenum pname, GLint param) {
   glPixelStorei(pname, param);
 }
 
+GLvoid StubGLPopGroupMarker() {
+    glPopGroupMarkerEXT();
+}
+
+GLvoid StubGLPushGroupMarker(GLsizei length, const char* marker) {
+    glPushGroupMarkerEXT(length, marker);
+}
+
 GLvoid StubGLQueryCounter(GLuint id, GLenum target) {
   glQueryCounter(id, target);
 }
 
 GLvoid StubGLReadBuffer(GLenum src) {
   glReadBuffer(src);
 }
 
 GLvoid StubGLReadPixels(GLint x, GLint y, GLsizei width, GLsizei height,
                         GLenum format, GLenum type, void* pixels) {
@@ skipping 335 matching lines @@
   functions->fBlitFramebuffer = StubGLBlitFramebuffer;
   functions->fMapBuffer = StubGLMapBuffer;
   functions->fUnmapBuffer = StubGLUnmapBuffer;
   functions->fBindFragDataLocationIndexed =
     StubGLBindFragDataLocationIndexed;
 
   return interface;
 }
 
 }  // namespace gfx