[Media Router] Use DialMediaSinkService in MediaRouterMojoImpl

chrome/common/media_router/mojo/media_router.mojom

Index: chrome/common/media_router/mojo/media_router.mojom
diff --git a/chrome/common/media_router/mojo/media_router.mojom b/chrome/common/media_router/mojo/media_router.mojom
index f1c657680314510c0ed740c22ce65c529ea58093..3a71d9ba04eb98c71306ff7158205940ea427e32 100644
--- a/chrome/common/media_router/mojo/media_router.mojom
+++ b/chrome/common/media_router/mojo/media_router.mojom
@@ -187,6 +187,15 @@ enum RouteRequestResultCode {
 // New values must be added here.
 };
 
+// Pass feature flags from browser to Media Route Provider
+struct MediaRouteProviderConfig {
+  // if browser side DIAL device discovery is enabled.

[mark a. foltz, 2017/05/01 20:32:57]

Would it make more sense to reverse the sense here, because this is a
configuration being passed *to* the MRP?

E.g., enable_dial_discovery means the MRP should enable discovery in the
component extension.

[zhaobin, 2017/05/03 01:54:00]

Done.

+  bool enable_dial_discovery;
+
+  // If browser side Cast device discovery is enabled.
+  bool enable_cast_discovery;
+};
+
 // Modeled after the MediaRouter interface defined in
 // chrome/browser/media/router/media_router.h
 interface MediaRouteProvider {
@@ -423,7 +432,7 @@ interface MediaRouter {
   // Returns a string that uniquely identifies the Media Router browser
   // process.
   RegisterMediaRouteProvider(MediaRouteProvider media_router_provider) =>
-      (string instance_id);
+      (string instance_id, MediaRouteProviderConfig config);
 
   // Called when the Media Route Manager receives a new list of |sinks|
   // compatible with |media_source|. The result is only valid for |origins|. If