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

chrome/browser/extensions/api/tab_capture/offscreen_presentation.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/extensions/api/tab_capture/offscreen_presentation.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "chrome/browser/extensions/api/tab_capture/tab_capture_registry.h"
+#include "chrome/browser/media/router/receiver_presentation_service_delegate_impl.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/web_contents_sizer.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #include "extensions/browser/extension_host.h"
 #include "extensions/browser/process_manager.h"
 
 #if defined(USE_AURA)
 #include "base/memory/weak_ptr.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 191 matching lines @@
 #endif
 
   // Set initial size, if specified.
   if (!initial_size.IsEmpty())
     ResizeWebContents(presentation_web_contents_.get(), initial_size);
 
   // Mute audio output.  When tab capture starts, the audio will be
   // automatically unmuted, but will be captured into the MediaStream.
   presentation_web_contents_->SetAudioMuted(true);
 
+  // Register the offscreen tab as the receiver of the offscreen presentation.
+  media_router::ReceiverPresentationServiceDelegateImpl::CreateForWebContents(
+      presentation_web_contents_.get(), presentation_id());
+
   // Navigate to the initial URL of the presentation.
   content::NavigationController::LoadURLParams load_params(start_url_);
   load_params.should_replace_current_entry = true;
   load_params.should_clear_history_list = true;
   presentation_web_contents_->GetController().LoadURLWithParams(load_params);
 
   start_time_ = base::TimeTicks::Now();
   DieIfContentCaptureEnded();
 }
 
@@ skipping 236 matching lines @@
 
   // Schedule the timer to check again in a second.
   capture_poll_timer_.Start(
       FROM_HERE,
       base::TimeDelta::FromSeconds(kPollIntervalInSeconds),
       base::Bind(&OffscreenPresentation::DieIfContentCaptureEnded,
                  base::Unretained(this)));
 }
 
 }  // namespace extensions