[Presentation API] Change connection to 'connected' if start a presentation with "https://www.googl…

third_party/WebKit/Source/modules/presentation/NavigatorPresentation.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/NavigatorPresentation.h"
 
+#include "core/dom/Document.h"
+#include "core/frame/LocalDOMWindow.h"
+#include "core/frame/LocalFrame.h"
 #include "core/frame/Navigator.h"
 #include "modules/presentation/Presentation.h"
 
 namespace blink {
 
 NavigatorPresentation::NavigatorPresentation() {}
 
 // static
 const char* NavigatorPresentation::supplementName() {
   return "NavigatorPresentation";
 }
 
 // static
+NavigatorPresentation* NavigatorPresentation::ensurePresentationReceiver(

[mark a. foltz, 2017/04/10 21:59:57]

Slight preference to move this to PresentationReceiver, i.e.

PresentationReceiver::from(Document& document)

or

PresentationReceiver::from(Navigator& navigator)


so the code in LocalFrameClientImpl looks similar to the other APIs that require
eager initialization.

[zhaobin, 2017/04/11 00:03:09]

Done.

+    Document& document) {
+  if (!document.frame() || !document.frame()->domWindow())
+    return 0;

[mark a. foltz, 2017/04/10 21:59:57]

nullptr

[zhaobin, 2017/04/11 00:03:09]

Done.

+  Navigator& navigator = *document.frame()->domWindow()->navigator();
+  NavigatorPresentation* presentation = &from(navigator);
+
+  if (navigator.frame()) {
+    // This need to be eagerly created in order to have the receiver associated
+    // with the client.
+    presentation->m_presentation = Presentation::create(navigator.frame());
+    presentation->m_presentation->receiver();
+  }
+  return presentation;
+}
+
+// static
 NavigatorPresentation& NavigatorPresentation::from(Navigator& navigator) {
   NavigatorPresentation* supplement = static_cast<NavigatorPresentation*>(
       Supplement<Navigator>::from(navigator, supplementName()));
   if (!supplement) {
     supplement = new NavigatorPresentation();
     provideTo(navigator, supplementName(), supplement);
   }
   return *supplement;
 }
 
 // static
 Presentation* NavigatorPresentation::presentation(Navigator& navigator) {
   NavigatorPresentation& self = NavigatorPresentation::from(navigator);
   if (!self.m_presentation) {
     if (!navigator.frame())
       return nullptr;
     self.m_presentation = Presentation::create(navigator.frame());
   }
   return self.m_presentation;
 }
 
 DEFINE_TRACE(NavigatorPresentation) {
   visitor->trace(m_presentation);
   Supplement<Navigator>::trace(visitor);
 }
 
 }  // namespace blink