[chrome.displaySource] Add WiFi Display session class skeleton and mojo service

extensions/browser/api/display_source/display_source_event_router.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 "extensions/browser/api/display_source/display_source_event_router.h"
 
 #include "content/public/browser/browser_context.h"
 #include "extensions/browser/api/display_source/display_source_api.h"
 #include "extensions/browser/api/display_source/display_source_connection_delegate_factory.h"
 #include "extensions/common/api/display_source.h"
@@ skipping 45 matching lines @@
     return;
 
   bool should_listen = event_router->HasEventListener(
       api::display_source::OnSinksUpdated::kEventName);
   if (should_listen && !listening_) {
     DisplaySourceConnectionDelegate* delegate =
         DisplaySourceConnectionDelegateFactory::GetForBrowserContext(
             browser_context_);
     if (delegate) {
       delegate->AddObserver(this);
-      delegate->StartWatchingSinks();
+      delegate->StartWatchingAvailableSinks();
     }
   }
   if (!should_listen && listening_) {
     DisplaySourceConnectionDelegate* delegate =
         DisplaySourceConnectionDelegateFactory::GetForBrowserContext(
             browser_context_);
     if (delegate) {
       delegate->RemoveObserver(this);
-      delegate->StopWatchingSinks();
+      delegate->StopWatchingAvailableSinks();
     }
   }
 
   listening_ = should_listen;
 }
 
 void DisplaySourceEventRouter::OnSinksUpdated(
     const DisplaySourceSinkInfoList& sinks) {
   EventRouter* event_router = EventRouter::Get(browser_context_);
   if (!event_router)
     return;
   scoped_ptr<base::ListValue> args(
       api::display_source::OnSinksUpdated::Create(sinks));
   scoped_ptr<Event> sinks_updated_event(
       new Event(events::DISPLAY_SOURCE_ON_SINKS_UPDATED,
                 api::display_source::OnSinksUpdated::kEventName, args.Pass()));
   event_router->BroadcastEvent(sinks_updated_event.Pass());
 }
 
 DisplaySourceEventRouter* DisplaySourceEventRouter::Create(
     content::BrowserContext* browser_context) {
   return new DisplaySourceEventRouter(browser_context);
 }
 
 }  // namespace extensions