[PresentationAPI] Implementing start/joinSession from WebPresentationClient to PresentationService.

content/renderer/presentation/presentation_dispatcher.h

 // 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.
 
 #ifndef CONTENT_RENDERER_PRESENTATION_PRESENTATION_DISPATCHER_H_
 #define CONTENT_RENDERER_PRESENTATION_PRESENTATION_DISPATCHER_H_
 
+#include <vector>
+
 #include "base/compiler_specific.h"
+#include "base/memory/linked_ptr.h"
 #include "content/common/content_export.h"
 #include "content/common/presentation/presentation_service.mojom.h"
 #include "content/public/renderer/render_frame_observer.h"
+#include "content/renderer/presentation/presentation_session_dispatcher.h"
 #include "third_party/WebKit/public/platform/modules/presentation/WebPresentationClient.h"
 
 namespace content {
 
 // PresentationDispatcher is a delegate for Presentation API messages used by
 // Blink. It forwards the calls to the Mojo PresentationService.
 class CONTENT_EXPORT PresentationDispatcher
     : public RenderFrameObserver,
       public NON_EXPORTED_BASE(blink::WebPresentationClient) {
  public:
   explicit PresentationDispatcher(RenderFrame* render_frame);
   ~PresentationDispatcher() override;
 
  private:
   // WebPresentationClient implementation.
   virtual void setController(
       blink::WebPresentationController* controller);
   virtual void updateAvailableChangeWatched(bool watched);
+  virtual void startSession(
+      const blink::WebString& presentationUrl,
+      const blink::WebString& presentationId,
+      blink::WebPresentationSessionCreateCallback* callback);
+  virtual void joinSession(
+      const blink::WebString& presentationUrl,
+      const blink::WebString& presentationId,
+      blink::WebPresentationSessionCreateCallback* callback);
 
   void OnScreenAvailabilityChanged(bool available);
+  void OnSessionCreated(
+    blink::WebPresentationSessionCreateCallback* callback,
+    bool success,
+    mojo::InterfaceRequest<presentation::PresentationSession> session_request,

[blundell, 2015/02/18 15:35:16]

Why is this called session_request? The idea is that this is a proxy to the
created session, right?

[whywhat, 2015/02/19 16:32:22]

I misunderstood the concept of passing a Object?& in Mojo. Fixed to be an
InterfacePtr.

+    const mojo::String& url,
+    const mojo::String& id,
+    const mojo::String& error);
 
   void ConnectToPresentationServiceIfNeeded();
 
   // Used as a weak reference. Can be null since lifetime is bound to the frame.
   blink::WebPresentationController* controller_;
   presentation::PresentationServicePtr presentation_service_;
+
+  // Wrappers around the PresentationSessionPtr corresponding to each Javascript
+  // PresentationSession object passed back to the frame.
+  typedef std::vector<linked_ptr<PresentationSessionDispatcher>>

[blundell, 2015/02/18 15:35:16]

Why linked_ptr?

[whywhat, 2015/02/19 16:32:22]

Forgot about the existence of ScopedPtr I guess.

+      PresentationSessions;
+  PresentationSessions presentation_sessions_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PRESENTATION_PRESENTATION_DISPATCHER_H_