Add hooks for GL_EXT_debug_marker in gpu

src/gpu/gl/mac/GrGLCreateNativeInterface_mac.cpp

Index: src/gpu/gl/mac/GrGLCreateNativeInterface_mac.cpp
diff --git a/src/gpu/gl/mac/GrGLCreateNativeInterface_mac.cpp b/src/gpu/gl/mac/GrGLCreateNativeInterface_mac.cpp
index f57b80ebc7de28174838679dc7d369ea3d370c74..f580997a89b71d678b52843103e1ce8c9c258b7e 100644
--- a/src/gpu/gl/mac/GrGLCreateNativeInterface_mac.cpp
+++ b/src/gpu/gl/mac/GrGLCreateNativeInterface_mac.cpp
@@ -241,6 +241,12 @@ const GrGLInterface* GrGLCreateNativeInterface() {
         GET_PROC(BindFragDataLocationIndexed);
     }
 
+    if (extensions.has("GL_EXT_debug_marker")) {
+        GET_PROC_SUFFIX(InsertEventMarker, EXT);
+        GET_PROC_SUFFIX(PushGroupMarker, EXT);
+        GET_PROC_SUFFIX(PopGroupMarker, EXT);
+    }
+
     interface->fExtensions.swap(&extensions);
     return interface;
 }