[Presentation API] (browser side) Implement reconnect() for 1-UA mode

third_party/WebKit/Source/modules/presentation/PresentationConnection.cpp

 // 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.
 
 #include "modules/presentation/PresentationConnection.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMArrayBuffer.h"
 #include "core/dom/DOMArrayBufferView.h"
 #include "core/dom/Document.h"
@@ skipping 423 matching lines @@
   if (m_state == state)
     return;
 
   m_state = state;
 
   if (!shouldDispatchEvent)
     return;
 
   switch (m_state) {
     case WebPresentationConnectionState::Connecting:
-      NOTREACHED();

[imcheng, 2017/03/16 01:42:51]

Why this change?

[zhaobin, 2017/03/16 18:50:30]

reconnect() on the same connection object will change 'closed' connection to
'connecting'.

       return;
     case WebPresentationConnectionState::Connected:
       dispatchStateChangeEvent(Event::create(EventTypeNames::connect));
       return;
     case WebPresentationConnectionState::Terminated:
       dispatchStateChangeEvent(Event::create(EventTypeNames::terminate));
       return;
     // Closed state is handled in |didClose()|.
     case WebPresentationConnectionState::Closed:
       NOTREACHED();
@@ skipping 61 matching lines @@
 void PresentationConnection::tearDown() {
   // Cancel current Blob loading if any.
   if (m_blobLoader) {
     m_blobLoader->cancel();
     m_blobLoader.clear();
   }
   m_messages.clear();
 }
 
 }  // namespace blink