Update the native_viewport interface to allow specification of the surface configuration, currently…

mojo/services/native_viewport/public/interfaces/native_viewport.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 "geometry/public/interfaces/geometry.mojom";
 import "gpu/public/interfaces/context_provider.mojom";
 import "input_events/public/interfaces/input_events.mojom";
 
 struct ViewportMetrics {
   Size size;
   float device_pixel_ratio = 1.0;
 };
 
+struct SurfaceConfiguration {
+  uint8 red_bits = 8;
+  uint8 green_bits = 8;
+  uint8 blue_bits = 8;
+  uint8 alpha_bits = 8;
+  uint8 depth_bits;
+  uint8 stencil_bits;
+};
+
 interface NativeViewport {
   // TODO(sky): having a create function is awkward. Should there be a factory
   // to create the NativeViewport that takes the size?
-  Create(Size size) => (ViewportMetrics metrics);
+  Create(Size size, SurfaceConfiguration requested_configuration) => (ViewportMetrics metrics);
 
   Show();
   Hide();
   Close();
   SetSize(Size size);
   SetEventDispatcher(NativeViewportEventDispatcher dispatcher);
 
   // Requests a ContextProvider capable of producing contexts that draw to
   // this native viewport.
   GetContextProvider(ContextProvider& provider);
 
   // The initial viewport metrics will be sent in the reply to the Create
   // method. Call RequestMetrics() to receive updates when the viewport metrics
   // change. The reply will be sent when the viewport metrics are different from
   // the values last sent, so to receive continuous updates call this method
   // again after receiving the callback.
   RequestMetrics() => (ViewportMetrics metrics);
 };
 
 interface NativeViewportEventDispatcher {
   OnEvent(Event event) => ();
 };