Add hooks for GL_EXT_debug_marker in gpu

src/gpu/gl/angle/GrGLCreateANGLEInterface.cpp

Index: src/gpu/gl/angle/GrGLCreateANGLEInterface.cpp
diff --git a/src/gpu/gl/angle/GrGLCreateANGLEInterface.cpp b/src/gpu/gl/angle/GrGLCreateANGLEInterface.cpp
index 1695c3c36f5d0a99d456435c4a00d6f7cee888ad..95229df36de8bde95d5ecf3294b1c5718618e6fa 100644
--- a/src/gpu/gl/angle/GrGLCreateANGLEInterface.cpp
+++ b/src/gpu/gl/angle/GrGLCreateANGLEInterface.cpp
@@ -153,6 +153,12 @@ const GrGLInterface* GrGLCreateANGLEInterface() {
     functions->fMapBuffer = (GrGLMapBufferProc) eglGetProcAddress("glMapBufferOES");
     functions->fUnmapBuffer = (GrGLUnmapBufferProc) eglGetProcAddress("glUnmapBufferOES");
 
+    if (extensions.has("GL_EXT_debug_marker")) {
+        functions->fInsertEventMarker = (GrGLInsertEventMarkerProc) eglGetProcAddress("glInsertEventMarkerEXT");
+        functions->fPushGroupMarker = (GrGLInsertEventMarkerProc) eglGetProcAddress("glPushGroupMarkerEXT");
+        functions->fPopGroupMarker = (GrGLPopGroupMarkerProc) eglGetProcAddress("glPopGropuMarkerEXT");
+    }
+
     interface->fExtensions.init(kGLES_GrGLStandard,
                                 interface->fFunctions.fGetString,
                                 interface->fFunctions.fGetStringi,