Add hooks for GL_EXT_debug_marker in gpu

src/gpu/gl/mesa/GrGLCreateMesaInterface.cpp

Index: src/gpu/gl/mesa/GrGLCreateMesaInterface.cpp
diff --git a/src/gpu/gl/mesa/GrGLCreateMesaInterface.cpp b/src/gpu/gl/mesa/GrGLCreateMesaInterface.cpp
index 59314445b348686316c0ca0076f40f798803cc28..0ce6d2f295ca5b98f7ff121da7de62af046b184a 100644
--- a/src/gpu/gl/mesa/GrGLCreateMesaInterface.cpp
+++ b/src/gpu/gl/mesa/GrGLCreateMesaInterface.cpp
@@ -221,6 +221,12 @@ const GrGLInterface* GrGLCreateMesaInterface() {
         }
         GR_GL_GET_PROC(BindFragDataLocationIndexed);
 
+        if (extensions.has("GL_EXT_debug_marker")) {
+            GR_GL_GET_PROC_SUFFIX(InsertEventMarker, EXT);
+            GR_GL_GET_PROC_SUFFIX(PopGroupMarker, EXT);
+            GR_GL_GET_PROC_SUFFIX(PushGroupMarker, EXT);
+        }
+
         interface->fStandard = kGL_GrGLStandard;
         interface->fExtensions.swap(&extensions);