Close all active PeerConnections upon OS suspend

content/browser/renderer_host/media/peer_connection_tracker_host.cc

 // Copyright (c) 2013 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 "content/browser/renderer_host/media/peer_connection_tracker_host.h"
 
+#include "base/power_monitor/power_monitor.h"
 #include "content/browser/media/webrtc_internals.h"
 #include "content/common/media/peer_connection_tracker_messages.h"
+#include "content/public/browser/render_process_host.h"
 
 namespace content {
 
 PeerConnectionTrackerHost::PeerConnectionTrackerHost(int render_process_id)
     : BrowserMessageFilter(PeerConnectionTrackerMsgStart),
-      render_process_id_(render_process_id) {}
+      render_process_id_(render_process_id) {
+  base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
+  if (power_monitor)
+    power_monitor->AddObserver(this);
+}
 
 bool PeerConnectionTrackerHost::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
 
   IPC_BEGIN_MESSAGE_MAP(PeerConnectionTrackerHost, message)
     IPC_MESSAGE_HANDLER(PeerConnectionTrackerHost_AddPeerConnection,
                         OnAddPeerConnection)
     IPC_MESSAGE_HANDLER(PeerConnectionTrackerHost_RemovePeerConnection,
                         OnRemovePeerConnection)
     IPC_MESSAGE_HANDLER(PeerConnectionTrackerHost_UpdatePeerConnection,
                         OnUpdatePeerConnection)
     IPC_MESSAGE_HANDLER(PeerConnectionTrackerHost_AddStats, OnAddStats)
     IPC_MESSAGE_HANDLER(PeerConnectionTrackerHost_GetUserMedia, OnGetUserMedia)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 void PeerConnectionTrackerHost::OverrideThreadForMessage(
     const IPC::Message& message, BrowserThread::ID* thread) {
   if (IPC_MESSAGE_CLASS(message) == PeerConnectionTrackerMsgStart)
     *thread = BrowserThread::UI;
 }
 
+void PeerConnectionTrackerHost::OnSuspend() {

[nasko, 2014/08/15 19:14:19]

nit: I'd move this below with the rest of the methods that deal with IPCs. 

[vrk (LEFT CHROMIUM), 2014/08/15 23:35:25]

Done.

+  content::RenderProcessHost* host =
+      content::RenderProcessHost::FromID(render_process_id_);
+  if (host)

[nasko, 2014/08/15 19:14:18]

This object is created and owned by RenderProcessHost, right? Is there a case
where host will be NULL? If not, it is better to use CHECK(host) to ensure this
is never violated.

[vrk (LEFT CHROMIUM), 2014/08/15 23:35:26]

Good point, Done.

+    host->Send(new PeerConnectionTracker_OnSuspend());
+}
+
 PeerConnectionTrackerHost::~PeerConnectionTrackerHost() {
+  base::PowerMonitor* power_monitor = base::PowerMonitor::Get();
+  if (power_monitor)
+    power_monitor->RemoveObserver(this);
 }
 
 void PeerConnectionTrackerHost::OnAddPeerConnection(
     const PeerConnectionInfo& info) {
   WebRTCInternals::GetInstance()->OnAddPeerConnection(
       render_process_id_,
       peer_pid(),
       info.lid,
       info.url,
       info.rtc_configuration,
@@ skipping 27 matching lines @@
   WebRTCInternals::GetInstance()->OnGetUserMedia(render_process_id_,
                                                  peer_pid(),
                                                  origin,
                                                  audio,
                                                  video,
                                                  audio_constraints,
                                                  video_constraints);
 }
 
 }  // namespace content