[mojo-bindings] Support reuse of native enum classes

components/mus/public/interfaces/compositor_frame.mojom

Index: components/mus/public/interfaces/compositor_frame.mojom
diff --git a/components/mus/public/interfaces/compositor_frame.mojom b/components/mus/public/interfaces/compositor_frame.mojom
index 38ab06f6ff5d7f2f9b7877be818734eaf34713c2..d12f3f39276d925554ca91942e8ed65349d6b483 100644
--- a/components/mus/public/interfaces/compositor_frame.mojom
+++ b/components/mus/public/interfaces/compositor_frame.mojom
@@ -7,28 +7,13 @@ module mus.mojom;
 import "ui/mojo/geometry/geometry.mojom";
 import "components/mus/public/interfaces/quads.mojom";
 
-enum ResourceFormat {
-  RGBA_8888,
-  RGBA_4444,
-  BGRA_8888,
-  ALPHA_8,
-  LUMINANCE_8,
-  RGB_565,
-  ETC1,
-};
+// See src/cc/resources/resource_format.h
+[Native=True]
+enum ResourceFormat;
 
 // See src/gpu/command_buffer/common/constants.h
-enum CommandBufferNamespace {
-  INVALID = -1,
-
-  GPU_IO,
-  IN_PROCESS,
-  MOJO,
-  MOJO_LOCAL,
-  OLD_SYNC_POINTS,
-
-  NUM_COMMAND_BUFFER_NAMESPACES
-};
+[Native=True]
+enum CommandBufferNamespace;
 
 // See src/gpu/command_buffer/common/sync_token.h
 struct SyncToken {