Add support for GL_EXT_debug_marker.

shell/native_application_support.cc

Index: shell/native_application_support.cc
diff --git a/shell/native_application_support.cc b/shell/native_application_support.cc
index 286a2d0f9e0b8bee24e9ebd1045ac1b3e1282cc6..f9db3fbe28ee6a02eb6cd200368c5f565346c677 100644
--- a/shell/native_application_support.cc
+++ b/shell/native_application_support.cc
@@ -12,6 +12,7 @@
 #include "mojo/public/platform/native/gles2_impl_chromium_sub_image_thunks.h"
 #include "mojo/public/platform/native/gles2_impl_chromium_sync_point_thunks.h"
 #include "mojo/public/platform/native/gles2_impl_chromium_texture_mailbox_thunks.h"
+#include "mojo/public/platform/native/gles2_impl_ext_debug_marker_thunks.h"
 #include "mojo/public/platform/native/gles2_impl_occlusion_query_ext_thunks.h"
 #include "mojo/public/platform/native/gles2_impl_oes_vertex_array_object_thunks.h"
 #include "mojo/public/platform/native/gles2_impl_thunks.h"
@@ -86,6 +87,8 @@ bool RunNativeApplication(
     // If the application is using GLES2 extension points, register those
     // thunks. Applications may use or not use any of these, so don't warn if
     // they are missing.
+    SetThunks(MojoMakeGLES2ImplExtDebugMarkerThunks,
+              "MojoSetGLES2ImplExtDebugMarkerThunks", app_library);
     SetThunks(MojoMakeGLES2ImplOcclusionQueryExtThunks,
               "MojoSetGLES2ImplOcclusionQueryExtThunks", app_library);
     SetThunks(MojoMakeGLES2ImplOesVertexArrayObjectThunks,