[Media Router] Add Connecting state to PresentationConnection to bring align with spec

content/renderer/presentation/presentation_dispatcher.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 "content/renderer/presentation/presentation_dispatcher.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 24 matching lines @@
       return blink::WebPresentationError::ErrorTypeNoPresentationFound;
     case presentation::PRESENTATION_ERROR_TYPE_UNKNOWN:
     default:
       return blink::WebPresentationError::ErrorTypeUnknown;
   }
 }
 
 blink::WebPresentationConnectionState GetWebPresentationConnectionStateFromMojo(
     presentation::PresentationConnectionState mojoSessionState) {
   switch (mojoSessionState) {
+    // TODO(imcheng): Add Connecting state to Blink (crbug.com/575351).
     case presentation::PRESENTATION_CONNECTION_STATE_CONNECTED:
       return blink::WebPresentationConnectionState::Connected;
     case presentation::PRESENTATION_CONNECTION_STATE_CLOSED:
       return blink::WebPresentationConnectionState::Closed;
     case presentation::PRESENTATION_CONNECTION_STATE_TERMINATED:
       return blink::WebPresentationConnectionState::Terminated;
+    default:
+      NOTREACHED();
+      return blink::WebPresentationConnectionState::Terminated;
   }
-
-  NOTREACHED();
-  return blink::WebPresentationConnectionState::Terminated;
 }
 
 }  // namespace
 
 namespace content {
 
 PresentationDispatcher::PresentationDispatcher(RenderFrame* render_frame)
     : RenderFrameObserver(render_frame),
       controller_(nullptr),
       binding_(this) {
@@ skipping 436 matching lines @@
 PresentationDispatcher::AvailabilityStatus::AvailabilityStatus(
     const std::string& availability_url)
     : url(availability_url),
       last_known_availability(false),
       listening_state(ListeningState::INACTIVE) {}
 
 PresentationDispatcher::AvailabilityStatus::~AvailabilityStatus() {
 }
 
 }  // namespace content