[Presentation API] 1-UA presentation support + presenter APIs.

chrome/browser/media/router/presentation_service_delegate_impl.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 "chrome/browser/media/router/presentation_service_delegate_impl.h"
 
 #include <string>
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/containers/scoped_ptr_map.h"
 #include "base/containers/small_map.h"
-#include "base/guid.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/media/router/create_presentation_session_request.h"
 #include "chrome/browser/media/router/media_route.h"
 #include "chrome/browser/media/router/media_router.h"
 #include "chrome/browser/media/router/media_router_dialog_controller.h"
 #include "chrome/browser/media/router/media_router_factory.h"
 #include "chrome/browser/media/router/media_sink.h"
 #include "chrome/browser/media/router/media_source_helper.h"
+#include "chrome/browser/media/router/offscreen_presentation_manager.h"
+#include "chrome/browser/media/router/offscreen_presentation_manager_factory.h"
 #include "chrome/browser/media/router/presentation_media_sinks_observer.h"
 #include "chrome/browser/media/router/presentation_session_messages_observer.h"
 #include "chrome/browser/media/router/presentation_session_state_observer.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "content/public/browser/presentation_screen_availability_listener.h"
 #include "content/public/browser/presentation_session.h"
 #include "content/public/browser/presentation_session_state_listener.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(
     media_router::PresentationServiceDelegateImpl);
 
 using content::RenderFrameHost;
 
 namespace media_router {
 
+using OffscreenPresentationSession =
+    OffscreenPresentationManager::OffscreenPresentationSession;
+
 namespace {
 
 using DelegateObserver = content::PresentationServiceDelegate::Observer;
 using PresentationSessionErrorCallback =
     content::PresentationServiceDelegate::PresentationSessionErrorCallback;
 using PresentationSessionSuccessCallback =
     content::PresentationServiceDelegate::PresentationSessionSuccessCallback;
 
 // Returns the unique identifier for the supplied RenderFrameHost.
 RenderFrameHostId GetRenderFrameHostId(RenderFrameHost* render_frame_host) {
@@ skipping 14 matching lines @@
 }  // namespace
 
 // Used by PresentationServiceDelegateImpl to manage
 // listeners and default presentation info in a render frame.
 // Its lifetime:
 //  * PresentationFrameManager AddDelegateObserver
 //  * Reset 0+ times.
 //  * PresentationFrameManager.RemoveDelegateObserver.
 class PresentationFrame {
  public:
-  PresentationFrame(content::WebContents* web_contents, MediaRouter* router);
+  PresentationFrame(content::WebContents* web_contents,
+                    const RenderFrameHostId& render_frame_host_id,
+                    MediaRouter* router);
   ~PresentationFrame();
 
   // Mirror corresponding APIs in PresentationServiceDelegateImpl.
   bool SetScreenAvailabilityListener(
       content::PresentationScreenAvailabilityListener* listener);
   bool RemoveScreenAvailabilityListener(
       content::PresentationScreenAvailabilityListener* listener);
   bool HasScreenAvailabilityListenerForTest(
       const MediaSource::Id& source_id) const;
   std::string GetDefaultPresentationId() const;
+  void SendMessage(const content::PresentationSessionInfo& session,
+                   scoped_ptr<content::PresentationSessionMessage> message,
+                   const content::SendMessageCallback send_message_cb);
   bool ListenForSessionStateChange(
       content::PresentationSessionStateListener* listener);
   void ListenForSessionMessages(
       const content::PresentationSessionInfo& session,
       const content::PresentationSessionMessageCallback& message_cb);
   void Reset();
 
   const MediaRoute::Id GetRouteId(const std::string& presentation_id) const;
-  const std::vector<MediaRoute::Id> GetRouteIds() const;
   void OnPresentationSessionClosed(const std::string& presentation_id);
 
   void OnPresentationSessionStarted(
       bool is_default_presentation,
       const content::PresentationSessionInfo& session,
-      const MediaRoute::Id& route_id);
+      const MediaRoute& route);
   void OnPresentationServiceDelegateDestroyed() const;
 
   void set_delegate_observer(DelegateObserver* observer) {
     delegate_observer_ = observer;
   }
 
  private:
   MediaSource GetMediaSourceFromListener(
       content::PresentationScreenAvailabilityListener* listener) const;
+
+  // Gets the OffscreenPresentationSession associated with |presentation_id|
+  // within this frame. Returns nullptr if |presentation_id| is not
+  // registered as an offscreen presentation.
+  OffscreenPresentationSession* FindOffscreenSession(
+      const std::string& presentation_id) const;
+
   base::SmallMap<std::map<std::string, MediaRoute::Id>>
       presentation_id_to_route_id_;
   scoped_ptr<PresentationMediaSinksObserver> sinks_observer_;
 
+  // Controller objects for offscreen presentations. Note that offscreen
+  // presentations are manipulated with these objects instead of the observers
+  // and MediaRouter objects below.
+  // Maps from presentation ID to the corresponding OffscreenController within

[mark a. foltz, 2015/10/12 21:56:10]

Can this paragraph be wrapped?

[imcheng, 2015/10/17 01:00:24]

Done.

+  // this frame.
+  base::ScopedPtrMap<std::string, scoped_ptr<OffscreenPresentationSession>>
+      offscreen_presentation_sessions_;
+
+  // For non-offscreen presentations.
   // Maps from presentation ID to the corresponding presentation session's
   // state change observer within this frame.
   base::ScopedPtrMap<std::string, scoped_ptr<PresentationSessionStateObserver>>
       session_state_observers_;
   ScopedVector<PresentationSessionMessagesObserver> session_messages_observers_;
 
-  // References to the owning WebContents, and the corresponding MediaRouter.
-  const content::WebContents* web_contents_;
-  MediaRouter* router_;
+  // References to the owning WebContents.
+  const content::WebContents* const web_contents_;
+
+  // ID of owning RenderFrameHost.
+  const RenderFrameHostId render_frame_host_id_;
+
+  // References to MediaRouter / OffscreenPresentationManager owned by
+  // the associated BrowserContext. They (and the BrowserContext) are
+  // guaranteed to outlive this object.
+  MediaRouter* const router_;
+  OffscreenPresentationManager* const offscreen_presentation_manager_;
 
   DelegateObserver* delegate_observer_;
 };
 
-PresentationFrame::PresentationFrame(content::WebContents* web_contents,
-                                     MediaRouter* router)
+PresentationFrame::PresentationFrame(
+    content::WebContents* web_contents,
+    const RenderFrameHostId& render_frame_host_id,
+    MediaRouter* router)
     : web_contents_(web_contents),
+      render_frame_host_id_(render_frame_host_id),
       router_(router),
+      offscreen_presentation_manager_(
+          OffscreenPresentationManagerFactory::GetOrCreateForBrowserContext(
+              web_contents_->GetBrowserContext())),
       delegate_observer_(nullptr) {
   DCHECK(web_contents_);
   DCHECK(router_);
+  DCHECK(offscreen_presentation_manager_);
 }
 
 PresentationFrame::~PresentationFrame() {
 }
 
 void PresentationFrame::OnPresentationServiceDelegateDestroyed() const {
   if (delegate_observer_)
     delegate_observer_->OnDelegateDestroyed();
 }
 
 void PresentationFrame::OnPresentationSessionStarted(
     bool is_default_presentation,
     const content::PresentationSessionInfo& session,
-    const MediaRoute::Id& route_id) {
-  presentation_id_to_route_id_[session.presentation_id] = route_id;
+    const MediaRoute& route) {
+  const std::string& presentation_id = session.presentation_id;
+  presentation_id_to_route_id_[presentation_id] = route.media_route_id();
   if (is_default_presentation && delegate_observer_)
     delegate_observer_->OnDefaultPresentationStarted(session);
+  if (route.is_offscreen_presentation()) {
+    DCHECK(!ContainsKey(offscreen_presentation_sessions_, presentation_id));

[mark a. foltz, 2015/10/12 21:56:10]

Behavior in release builds?

[imcheng, 2015/10/17 01:00:24]

Changed ConnectToOffscreenPresentation to return nullptr in that case. There are
actually some legitimate corner cases that could cause this to happen, so I
removed the DCHECK too and added documentation.

+    scoped_ptr<OffscreenPresentationSession> offscreen_session =
+        offscreen_presentation_manager_->ConnectToOffscreenPresentation(
+            presentation_id, render_frame_host_id_);
+
+    // If |offscreen_session| is nullptr, then the receiver is most likely
+    // already gone, so the route will die soon. This should happen very rarely
+    // since the receiver has to unregister itself between when offscreen
+    // presentation was created and when the resulting route arrived at MR.
+    if (!offscreen_session) {
+      // TODO(imcheng): we should probably reject the route request in this
+      // case. crbug.com/513859
+      DLOG(ERROR) << "CreateOffscreenPresentationConnection returned nullptr.";
+    } else {
+      offscreen_presentation_sessions_.insert(presentation_id,
+                                              offscreen_session.Pass());
+    }
+  }
 }
 
 void PresentationFrame::OnPresentationSessionClosed(
     const std::string& presentation_id) {
   auto it = presentation_id_to_route_id_.find(presentation_id);
   if (it != presentation_id_to_route_id_.end()) {
     presentation_id_to_route_id_.erase(it);
   }
   // TODO(imcheng): Notify PresentationSessionStateObserver?
 }
 
 const MediaRoute::Id PresentationFrame::GetRouteId(
     const std::string& presentation_id) const {
   auto it = presentation_id_to_route_id_.find(presentation_id);
   return it != presentation_id_to_route_id_.end() ? it->second : "";
 }
 
-const std::vector<MediaRoute::Id> PresentationFrame::GetRouteIds() const {
-  std::vector<MediaRoute::Id> route_ids;
-  for (const auto& e : presentation_id_to_route_id_)
-    route_ids.push_back(e.second);
-  return route_ids;
-}
-
 bool PresentationFrame::SetScreenAvailabilityListener(
     content::PresentationScreenAvailabilityListener* listener) {
   if (sinks_observer_ && sinks_observer_->listener() == listener)
     return false;
 
   MediaSource source(GetMediaSourceFromListener(listener));
   sinks_observer_.reset(
       new PresentationMediaSinksObserver(router_, listener, source));
 
   if (!sinks_observer_->is_active()) {
@@ skipping 18 matching lines @@
     const MediaSource::Id& source_id) const {
   return sinks_observer_ && sinks_observer_->source().id() == source_id;
 }
 
 void PresentationFrame::Reset() {
   for (const auto& pid_route_id : presentation_id_to_route_id_)
     router_->OnPresentationSessionDetached(pid_route_id.second);
 
   presentation_id_to_route_id_.clear();
   sinks_observer_.reset();
+  offscreen_presentation_sessions_.clear();
   session_state_observers_.clear();
   session_messages_observers_.clear();
 }
 
+void PresentationFrame::SendMessage(
+    const content::PresentationSessionInfo& session,
+    scoped_ptr<content::PresentationSessionMessage> message,
+    const content::SendMessageCallback send_message_cb) {
+  auto it = presentation_id_to_route_id_.find(session.presentation_id);

[mark a. foltz, 2015/10/12 21:56:10]

This lookup only really makes sense for 2-UA presentations (no
|offscreen_session|) since there the page is messaging the route directly.  Move
to line 284?

[imcheng, 2015/10/17 01:00:24]

Done. Also done similarly for below.

+  if (it == presentation_id_to_route_id_.end()) {
+    DVLOG(2) << "ListenForSessionMessages: no route for "
+             << session.presentation_id;
+    return;
+  }
+
+  OffscreenPresentationSession* offscreen_session =
+      FindOffscreenSession(session.presentation_id);
+  if (offscreen_session) {
+    offscreen_session->SendMessage(message.Pass(), send_message_cb);
+  } else {
+    if (message->is_binary()) {
+      router_->SendRouteBinaryMessage(it->second, message->data.Pass(),
+                                      send_message_cb);
+    } else {
+      router_->SendRouteMessage(it->second, message->message, send_message_cb);
+    }
+  }
+}
+
+OffscreenPresentationSession* PresentationFrame::FindOffscreenSession(
+    const std::string& presentation_id) const {
+  auto offscreen_session_it =
+      offscreen_presentation_sessions_.find(presentation_id);
+  return offscreen_session_it != offscreen_presentation_sessions_.end()
+             ? offscreen_session_it->second
+             : nullptr;
+}
+
 bool PresentationFrame::ListenForSessionStateChange(
     content::PresentationSessionStateListener* listener) {
   std::string presentation_id(listener->GetSessionInfo().presentation_id);
   auto it = presentation_id_to_route_id_.find(presentation_id);
   if (it == presentation_id_to_route_id_.end()) {
     DVLOG(2) << "ListenForSessionStateChange: no route for " << presentation_id;
     return false;
   }
 
-  if (ContainsKey(session_state_observers_, presentation_id)) {
-    DVLOG(2) << "ListenForSessionStateChange: already contains a state "
-             << "observer for session " << presentation_id;
-    return false;
+  OffscreenPresentationSession* offscreen_session =
+      FindOffscreenSession(presentation_id);
+  if (offscreen_session) {
+    offscreen_session->ListenForStateChanges(listener);
+    return true;
+  } else {

[whywhat, 2015/10/13 15:21:31]

nit: remove else

[imcheng, 2015/10/17 01:00:24]

Done.

+    if (ContainsKey(session_state_observers_, presentation_id)) {
+      DVLOG(2) << "ListenForSessionStateChange: already contains a state "
+               << "observer for session " << presentation_id;
+      return false;
+    }
+
+    session_state_observers_.insert(
+        presentation_id, make_scoped_ptr(new PresentationSessionStateObserver(
+                             listener, it->second, router_)));
+    return true;
   }
-
-  session_state_observers_.insert(
-      presentation_id, make_scoped_ptr(new PresentationSessionStateObserver(
-                           listener, it->second, router_)));
-  return true;
 }
 
 void PresentationFrame::ListenForSessionMessages(
     const content::PresentationSessionInfo& session,
     const content::PresentationSessionMessageCallback& message_cb) {
   auto it = presentation_id_to_route_id_.find(session.presentation_id);
   if (it == presentation_id_to_route_id_.end()) {
     DVLOG(2) << "ListenForSessionMessages: no route for "
              << session.presentation_id;
     return;
   }
 
-  session_messages_observers_.push_back(
-      new PresentationSessionMessagesObserver(message_cb, it->second, router_));
+  OffscreenPresentationSession* offscreen_session =
+      FindOffscreenSession(session.presentation_id);
+  if (offscreen_session) {
+    offscreen_session->ListenForMessages(message_cb);
+  } else {
+    session_messages_observers_.push_back(
+        new PresentationSessionMessagesObserver(message_cb, it->second,
+                                                router_));
+  }
 }
 
 MediaSource PresentationFrame::GetMediaSourceFromListener(
     content::PresentationScreenAvailabilityListener* listener) const {
   // If the default presentation URL is empty then fall back to tab mirroring.
   std::string availability_url(listener->GetAvailabilityUrl());
   return availability_url.empty()
              ? MediaSourceForTab(SessionTabHelper::IdForTab(web_contents_))
              : MediaSourceForPresentationUrl(availability_url);
 }
 
 // Used by PresentationServiceDelegateImpl to manage PresentationFrames.
 class PresentationFrameManager {
  public:
   PresentationFrameManager(content::WebContents* web_contents,
                            MediaRouter* router);
   ~PresentationFrameManager();
 
   // Mirror corresponding APIs in PresentationServiceDelegateImpl.
   bool SetScreenAvailabilityListener(
       const RenderFrameHostId& render_frame_host_id,
       content::PresentationScreenAvailabilityListener* listener);
   bool RemoveScreenAvailabilityListener(
       const RenderFrameHostId& render_frame_host_id,
       content::PresentationScreenAvailabilityListener* listener);
+  void SendMessage(const RenderFrameHostId& render_frame_host_id,
+                   const content::PresentationSessionInfo& session,
+                   scoped_ptr<content::PresentationSessionMessage> message,
+                   const content::SendMessageCallback send_message_cb);
   bool ListenForSessionStateChange(
       const RenderFrameHostId& render_frame_host_id,
       content::PresentationSessionStateListener* listener);
   void ListenForSessionMessages(
       const RenderFrameHostId& render_frame_host_id,
       const content::PresentationSessionInfo& session,
       const content::PresentationSessionMessageCallback& message_cb);
   void AddDelegateObserver(const RenderFrameHostId& render_frame_host_id,
                            DelegateObserver* observer);
   void RemoveDelegateObserver(const RenderFrameHostId& render_frame_host_id);
   void Reset(const RenderFrameHostId& render_frame_host_id);
   bool HasScreenAvailabilityListenerForTest(
       const RenderFrameHostId& render_frame_host_id,
       const MediaSource::Id& source_id) const;
   void SetMediaRouterForTest(MediaRouter* router);
 
   void OnPresentationSessionStarted(
       const RenderFrameHostId& render_frame_host_id,
       bool is_default_presentation,
       const content::PresentationSessionInfo& session,
-      const MediaRoute::Id& route_id);
+      const MediaRoute& route);
 
   void OnPresentationSessionClosed(
       const RenderFrameHostId& render_frame_host_id,
       const std::string& presentation_id);
   const MediaRoute::Id GetRouteId(const RenderFrameHostId& render_frame_host_id,
                                   const std::string& presentation_id) const;
-  const std::vector<MediaRoute::Id> GetRouteIds(
-      const RenderFrameHostId& render_frame_host_id) const;
 
  private:
   PresentationFrame* GetOrAddPresentationFrame(
       const RenderFrameHostId& render_frame_host_id);
 
   // Maps a frame identifier to a PresentationFrame object for frames
   // that are using presentation API.
   base::ScopedPtrHashMap<RenderFrameHostId, scoped_ptr<PresentationFrame>>
       presentation_frames_;
 
   // References to the owning WebContents, and the corresponding MediaRouter.
+  content::WebContents* const web_contents_;
   MediaRouter* router_;
-  content::WebContents* web_contents_;
 };
 
 PresentationFrameManager::PresentationFrameManager(
     content::WebContents* web_contents,
     MediaRouter* router)
-    : router_(router), web_contents_(web_contents) {
+    : web_contents_(web_contents), router_(router) {
   DCHECK(web_contents_);
   DCHECK(router_);
 }
 
 PresentationFrameManager::~PresentationFrameManager() {
   for (auto& frame : presentation_frames_)
     frame.second->OnPresentationServiceDelegateDestroyed();
 }
 
 void PresentationFrameManager::OnPresentationSessionStarted(
     const RenderFrameHostId& render_frame_host_id,
     bool is_default_presentation,
     const content::PresentationSessionInfo& session,
-    const MediaRoute::Id& route_id) {
+    const MediaRoute& route) {
   auto presentation_frame = presentation_frames_.get(render_frame_host_id);
-  if (presentation_frame)
+  if (presentation_frame) {
     presentation_frame->OnPresentationSessionStarted(is_default_presentation,
-                                                     session, route_id);
+                                                     session, route);
+  }
 }
 
 void PresentationFrameManager::OnPresentationSessionClosed(
     const RenderFrameHostId& render_frame_host_id,
     const std::string& presentation_id) {
   auto presentation_frame = presentation_frames_.get(render_frame_host_id);
   if (presentation_frame)
     presentation_frame->OnPresentationSessionClosed(presentation_id);
 }
 
 const MediaRoute::Id PresentationFrameManager::GetRouteId(
     const RenderFrameHostId& render_frame_host_id,
     const std::string& presentation_id) const {
   auto presentation_frame = presentation_frames_.get(render_frame_host_id);
   return presentation_frame ? presentation_frame->GetRouteId(presentation_id)
                             : "";
 }
 
-const std::vector<MediaRoute::Id> PresentationFrameManager::GetRouteIds(
-    const RenderFrameHostId& render_frame_host_id) const {
-  auto presentation_frame = presentation_frames_.get(render_frame_host_id);
-  return presentation_frame ? presentation_frame->GetRouteIds()
-                            : std::vector<MediaRoute::Id>();
-}
-
 bool PresentationFrameManager::SetScreenAvailabilityListener(
     const RenderFrameHostId& render_frame_host_id,
     content::PresentationScreenAvailabilityListener* listener) {
   DCHECK(listener);
   auto presentation_frame = GetOrAddPresentationFrame(render_frame_host_id);
   return presentation_frame->SetScreenAvailabilityListener(listener);
 }
 
 bool PresentationFrameManager::RemoveScreenAvailabilityListener(
     const RenderFrameHostId& render_frame_host_id,
     content::PresentationScreenAvailabilityListener* listener) {
   DCHECK(listener);
   auto presentation_frame = presentation_frames_.get(render_frame_host_id);
   return presentation_frame &&
          presentation_frame->RemoveScreenAvailabilityListener(listener);
 }
 
 bool PresentationFrameManager::HasScreenAvailabilityListenerForTest(
     const RenderFrameHostId& render_frame_host_id,
     const MediaSource::Id& source_id) const {
   auto presentation_frame = presentation_frames_.get(render_frame_host_id);
   return presentation_frame &&
          presentation_frame->HasScreenAvailabilityListenerForTest(source_id);
 }
 
+void PresentationFrameManager::SendMessage(
+    const RenderFrameHostId& render_frame_host_id,
+    const content::PresentationSessionInfo& session,
+    scoped_ptr<content::PresentationSessionMessage> message,
+    const content::SendMessageCallback send_message_cb) {
+  PresentationFrame* presentation_frame =
+      presentation_frames_.get(render_frame_host_id);
+  if (!presentation_frame) {
+    DVLOG(2) << "SendMessage: PresentationFrame does not exist "
+             << "for: (" << render_frame_host_id.first << ", "
+             << render_frame_host_id.second << ")";
+    send_message_cb.Run(false);
+    return;
+  }
+
+  presentation_frame->SendMessage(session, message.Pass(), send_message_cb);
+}
+
 bool PresentationFrameManager::ListenForSessionStateChange(
     const RenderFrameHostId& render_frame_host_id,
     content::PresentationSessionStateListener* listener) {
   PresentationFrame* presentation_frame =
       GetOrAddPresentationFrame(render_frame_host_id);
   return presentation_frame->ListenForSessionStateChange(listener);
 }
 
 void PresentationFrameManager::ListenForSessionMessages(
     const RenderFrameHostId& render_frame_host_id,
@@ skipping 31 matching lines @@
   auto presentation_frame = presentation_frames_.get(render_frame_host_id);
   if (presentation_frame)
     presentation_frame->Reset();
 }
 
 PresentationFrame* PresentationFrameManager::GetOrAddPresentationFrame(
     const RenderFrameHostId& render_frame_host_id) {
   if (!presentation_frames_.contains(render_frame_host_id)) {
     presentation_frames_.add(
         render_frame_host_id,
-        scoped_ptr<PresentationFrame>(
-            new PresentationFrame(web_contents_, router_)));
+        scoped_ptr<PresentationFrame>(new PresentationFrame(
+            web_contents_, render_frame_host_id, router_)));
   }
   return presentation_frames_.get(render_frame_host_id);
 }
 
 void PresentationFrameManager::SetMediaRouterForTest(MediaRouter* router) {
   router_ = router;
 }
 
 PresentationServiceDelegateImpl*
 PresentationServiceDelegateImpl::GetOrCreateForWebContents(
@@ skipping 111 matching lines @@
     const MediaRoute* route,
     const std::string& presentation_id,
     const std::string& error_text) {
   if (!route) {
     error_cb.Run(content::PresentationError(
         content::PRESENTATION_ERROR_NO_PRESENTATION_FOUND, error_text));
   } else {
     DVLOG(1) << "OnJoinRouteResponse: "
              << "route_id: " << route->media_route_id()
              << ", presentation URL: " << session.presentation_url
-             << ", presentation ID: " << session.presentation_id;
+             << ", presentation ID: " << session.presentation_id
+             << ", offscreen? " << route->is_offscreen_presentation();
     DCHECK_EQ(session.presentation_id, presentation_id);
-    frame_manager_->OnPresentationSessionStarted(
-        RenderFrameHostId(render_process_id, render_frame_id), false, session,
-        route->media_route_id());
+    RenderFrameHostId rfh_id(render_process_id, render_frame_id);
+    frame_manager_->OnPresentationSessionStarted(rfh_id, false, session,
+                                                 *route);
     success_cb.Run(session);
   }
 }
 
 void PresentationServiceDelegateImpl::OnStartSessionSucceeded(
     int render_process_id,
     int render_frame_id,
     const PresentationSessionSuccessCallback& success_cb,
     const content::PresentationSessionInfo& new_session,
-    const MediaRoute::Id& route_id) {
+    const MediaRoute& route) {
+  const MediaRoute::Id& route_id = route.media_route_id();
   DVLOG(1) << "OnStartSessionSucceeded: "
            << "route_id: " << route_id
            << ", presentation URL: " << new_session.presentation_url
            << ", presentation ID: " << new_session.presentation_id;
-  frame_manager_->OnPresentationSessionStarted(
-      RenderFrameHostId(render_process_id, render_frame_id), false, new_session,
-      route_id);
+  RenderFrameHostId rfh_id(render_process_id, render_frame_id);
+  frame_manager_->OnPresentationSessionStarted(rfh_id, false, new_session,
+                                               route);
   success_cb.Run(new_session);
 }
 
 void PresentationServiceDelegateImpl::StartSession(
     int render_process_id,
     int render_frame_id,
     const std::string& presentation_url,
     const PresentationSessionSuccessCallback& success_cb,
     const PresentationSessionErrorCallback& error_cb) {
   if (presentation_url.empty() || !IsValidPresentationUrl(presentation_url)) {
@@ skipping 52 matching lines @@
     return;
   }
   router_->CloseRoute(route_id);
 }
 
 void PresentationServiceDelegateImpl::ListenForSessionMessages(
     int render_process_id,
     int render_frame_id,
     const content::PresentationSessionInfo& session,
     const content::PresentationSessionMessageCallback& message_cb) {
-  frame_manager_->ListenForSessionMessages(
-      RenderFrameHostId(render_process_id, render_frame_id), session,
-      message_cb);
+  RenderFrameHostId render_frame_host_id(render_process_id, render_frame_id);
+  frame_manager_->ListenForSessionMessages(render_frame_host_id, session,
+                                           message_cb);
 }
 
 void PresentationServiceDelegateImpl::SendMessage(
     int render_process_id,
     int render_frame_id,
     const content::PresentationSessionInfo& session,
     scoped_ptr<content::PresentationSessionMessage> message,
-    const SendMessageCallback& send_message_cb) {
-  const MediaRoute::Id& route_id = frame_manager_->GetRouteId(
-      RenderFrameHostId(render_process_id, render_frame_id),
-      session.presentation_id);
-  if (route_id.empty()) {
-    DVLOG(1) << "No active route for  " << session.presentation_id;
-    send_message_cb.Run(false);
-    return;
-  }
-
-  if (message->is_binary()) {
-    router_->SendRouteBinaryMessage(route_id, message->data.Pass(),
-                                    send_message_cb);
-  } else {
-    router_->SendRouteMessage(route_id, message->message, send_message_cb);
-  }
+    const content::SendMessageCallback& send_message_cb) {
+  RenderFrameHostId render_frame_host_id(render_process_id, render_frame_id);
+  frame_manager_->SendMessage(render_frame_host_id, session, message.Pass(),
+                              send_message_cb);
 }
 
 bool PresentationServiceDelegateImpl::ListenForSessionStateChange(
     int render_process_id,
     int render_frame_id,
     content::PresentationSessionStateListener* listener) {
   return frame_manager_->ListenForSessionStateChange(
       RenderFrameHostId(render_process_id, render_frame_id), listener);
 }
 
+void PresentationServiceDelegateImpl::NotifyWhenReceiverSessionIsAvailable(
+    int render_process_id,
+    int render_frame_id,
+    const content::PresentationReceiverSessionAvailableCallback& callback) {
+  // We only support receiver APIs in offscreen tabs created for offscreen
+  // presentations.
+  // See ReceiverPresentationServiceDelegateImpl for details.

[mark a. foltz, 2015/10/12 21:56:10]

We need to decide how to handle the receiver APIs in Blink.  If we plumb through
a bit saying a frame belongs to an offscreen presentation, we could switch the
APIs between being no-ops and calling through to content.

Also see https://github.com/w3c/presentation-api/issues/205

[imcheng, 2015/10/17 01:00:24]

Ok, I think we decided on PresentationServiceDelegateImpl having both controller
and receiver logic. For the time being we could distinguish controller vs.
receiver context at the WebContents level (i.e., in OffscreenPresentation,
register offscreen tab WebContents as receiver context. All other Webcontents
are considered controller). Agreed that we will need additional mechanism if it
becomes a frame level property and/or allow a frame to be both controller and
receiver.

+  NOTIMPLEMENTED();
+  callback.Run(nullptr);
+}
+
+std::vector<content::PresentationSessionInfo>
+PresentationServiceDelegateImpl::GetPresentationReceiverSessions(
+    int render_process_id,
+    int render_frame_id) {
+  // See comment in |NotifyWhenReceiverSessionIsAvailable()|.
+  NOTIMPLEMENTED();
+  return std::vector<content::PresentationSessionInfo>();
+}
+
 void PresentationServiceDelegateImpl::OnRouteResponse(
     const MediaRoute* route,
     const std::string& presentation_id,
     const std::string& error) {
   if (!route)
     return;
+
   const MediaSource& source = route->media_source();
   DCHECK(!source.Empty());
   if (!default_source_.Equals(source))
     return;
+
   RenderFrameHost* main_frame = web_contents_->GetMainFrame();
   if (!main_frame)
     return;
+
   RenderFrameHostId render_frame_host_id(GetRenderFrameHostId(main_frame));
-  frame_manager_->OnPresentationSessionStarted(
-      render_frame_host_id, true,
-      content::PresentationSessionInfo(PresentationUrlFromMediaSource(source),
-                                       presentation_id),
-      route->media_route_id());
+  content::PresentationSessionInfo session(
+      PresentationUrlFromMediaSource(source), presentation_id);
+
+  frame_manager_->OnPresentationSessionStarted(render_frame_host_id, true,
+                                               session, *route);
 }
 
 void PresentationServiceDelegateImpl::AddDefaultMediaSourceObserver(
     DefaultMediaSourceObserver* observer) {
   default_media_source_observers_.AddObserver(observer);
 }
 
 void PresentationServiceDelegateImpl::RemoveDefaultMediaSourceObserver(
     DefaultMediaSourceObserver* observer) {
   default_media_source_observers_.RemoveObserver(observer);
@@ skipping 13 matching lines @@
 bool PresentationServiceDelegateImpl::HasScreenAvailabilityListenerForTest(
     int render_process_id,
     int render_frame_id,
     const MediaSource::Id& source_id) const {
   RenderFrameHostId render_frame_host_id(render_process_id, render_frame_id);
   return frame_manager_->HasScreenAvailabilityListenerForTest(
       render_frame_host_id, source_id);
 }
 
 }  // namespace media_router