Restructure public side of gpu service.

mojo/services/surfaces/public/interfaces/surfaces.mojom

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module mojo;
 
 import "mojo/services/geometry/public/interfaces/geometry.mojom";
-import "mojo/services/public/interfaces/gpu/command_buffer.mojom";
-import "mojo/services/public/interfaces/gpu/viewport_parameter_listener.mojom";
+import "mojo/services/gpu/public/interfaces/command_buffer.mojom";
+import "mojo/services/gpu/public/interfaces/viewport_parameter_listener.mojom";
 import "mojo/services/surfaces/public/interfaces/quads.mojom";
 import "mojo/services/surfaces/public/interfaces/surface_id.mojom";
 
 enum ResourceFormat {
   RGBA_8888,
   RGBA_4444,
   BGRA_8888,
   ALPHA_8,
   LUMINANCE_8,
   RGB_565,
@@ skipping 47 matching lines @@
   // surface will respond to the SubmitFrame message. Clients should use this
   // acknowledgement to ratelimit frame submissions.
   SubmitFrame(SurfaceId id, Frame frame) => ();
   DestroySurface(SurfaceId id);
 
   CreateGLES2BoundSurface(CommandBuffer gles2_client,
                           SurfaceId id,
                           Size size,
                           ViewportParameterListener& listener);
 };