[Media Router] Wire through a new MRPM call to update media sinks.

chrome/browser/media/router/mojo/media_router_mojo_impl.cc

 // Copyright 2015 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.
 
 #include "chrome/browser/media/router/mojo/media_router_mojo_impl.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 409 matching lines @@
   DCHECK(thread_checker_.CalledOnValidThread());
   issue_manager_.AddIssue(issue);
 }
 
 void MediaRouterMojoImpl::ClearIssue(const Issue::Id& issue_id) {
   DCHECK(thread_checker_.CalledOnValidThread());
   issue_manager_.ClearIssue(issue_id);
 }
 
 void MediaRouterMojoImpl::OnUserGesture() {
+  DoUserGestureDiscovery();
 #if defined(OS_WIN)
   EnsureMdnsDiscoveryEnabled();
 #endif
 }
 
 bool MediaRouterMojoImpl::RegisterMediaSinksObserver(
     MediaSinksObserver* observer) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   // Create an observer list for the media source and add |observer|
@@ skipping 539 matching lines @@
   }
 }
 
 void MediaRouterMojoImpl::OnFirewallCheckComplete(
     bool firewall_can_use_local_ports) {
   if (firewall_can_use_local_ports)
     EnsureMdnsDiscoveryEnabled();
 }
 #endif
 
+void MediaRouterMojoImpl::DoUserGestureDiscovery() {
+  SetWakeReason(MediaRouteProviderWakeReason::USER_GESTURE_DISCOVERY);

[mark a. foltz, 2016/04/07 22:45:00]

You need to check if the MRPM is awake and post a task if it isn't awake yet.
See the pattern in other methods in this API

[mark a. foltz, 2016/04/07 22:45:00]

You need to check if the MRPM is awake and post a task if it isn't awake yet.
See the pattern in other methods in this API

[amp, 2016/04/09 00:02:12]

Done.

+  media_route_provider_->StartDiscovery();
+}
+
 }  // namespace media_router