[PresentationAPI] Plumbing |onstatechange| event for the PresentationSession from Blink to platform/

Source/modules/presentation/Presentation.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 "config.h"
 #include "modules/presentation/Presentation.h"
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/LocalFrame.h"
 #include "modules/EventTargetModules.h"
 #include "modules/presentation/AvailableChangeEvent.h"
 #include "modules/presentation/DefaultSessionStartEvent.h"
 #include "modules/presentation/PresentationController.h"
 #include "modules/presentation/PresentationSessionClientCallbacks.h"
+#include "public/platform/modules/presentation/WebPresentationSessionClient.h"
 
 namespace blink {
 
 Presentation::Presentation(LocalFrame* frame)
     : DOMWindowProperty(frame)
 {
 }
 
 Presentation::~Presentation()
 {
@@ skipping 119 matching lines @@
 void Presentation::didStartDefaultSession(PresentationSession* session)
 {
     dispatchEvent(DefaultSessionStartEvent::create(EventTypeNames::defaultsessionstart, session));
 }
 
 void Presentation::registerSession(PresentationSession* session)
 {
     m_openSessions.add(session);
 }
 
+PresentationSession* Presentation::findSession(WebPresentationSessionClient* sessionClient)
+{
+    for (auto it = m_openSessions.begin(); it != m_openSessions.end(); ++it) {

[Peter Beverloo, 2015/03/20 19:07:40]

for (const auto& session : m_openSessions)

[whywhat, 2015/03/23 21:12:16]

Done. I can't use a const iterator since I need to return a pointer to the
mutable object.

+        if ((*it)->matches(sessionClient))
+            return it->get();
+    }
+    return nullptr;
+}
+
 PresentationController* Presentation::presentationController()
 {
     if (!frame())
         return nullptr;
     return PresentationController::from(*frame());
 }
 
 } // namespace blink