Chrome OS: avoid suspending on lid close when casting is active.

chrome/browser/media/media_capture_devices_dispatcher.cc

Index: chrome/browser/media/media_capture_devices_dispatcher.cc
diff --git a/chrome/browser/media/media_capture_devices_dispatcher.cc b/chrome/browser/media/media_capture_devices_dispatcher.cc
index 29c7afbec8d820c24b7dbcf33b752af116bfd7db..75bd24cde66679aa07c78477b38552afcec66291 100644
--- a/chrome/browser/media/media_capture_devices_dispatcher.cc
+++ b/chrome/browser/media/media_capture_devices_dispatcher.cc
@@ -39,6 +39,7 @@
 
 #if defined(OS_CHROMEOS)
 #include "ash/shell.h"
+#include "chromeos/display/output_configurator.h"
 #endif  //  defined(OS_CHROMEOS)
 
 using content::BrowserThread;
@@ -170,7 +171,8 @@ MediaCaptureDevicesDispatcher::MediaCaptureDevicesDispatcher()
     : devices_enumerated_(false),
       is_device_enumeration_disabled_(false),
       media_stream_capture_indicator_(new MediaStreamCaptureIndicator()),
-      audio_stream_indicator_(new AudioStreamIndicator()) {
+      audio_stream_indicator_(new AudioStreamIndicator()),
+      screen_sharing_count_(0) {
   // MediaCaptureDevicesDispatcher is a singleton. It should be created on
   // UI thread. Otherwise, it will not receive
   // content::NOTIFICATION_WEB_CONTENTS_DESTROYED, and that will result in
@@ -734,6 +736,23 @@ void MediaCaptureDevicesDispatcher::UpdateMediaRequestStateOnUIThread(
     }
   }
 
+  // Updates count of screen sharing sessions.
+  if (device.type == content::MEDIA_TAB_VIDEO_CAPTURE ||
+      device.type == content::MEDIA_DESKTOP_VIDEO_CAPTURE) {
+    if (state == content::MEDIA_REQUEST_STATE_DONE) {
+      ++screen_sharing_count_;
+    } else if (state == content::MEDIA_REQUEST_STATE_CLOSING) {
+      DCHECK_GT(screen_sharing_count_, 0);
+      --screen_sharing_count_;
+    }
+#if defined(OS_CHROMEOS)
+    chromeos::OutputConfigurator* configurator =

[Sergey Ulanov, 2014/01/15 02:51:20]

Can OutputConfigurator register to observe media streams using
MediaCaptureDevicesDispatcher::AddObserver()? Then you wouldn't need
chromeos-specific code here.

[hshi1, 2014/01/15 19:43:24]

Done.

+        ash::Shell::GetInstance()->output_configurator();
+   if (configurator)

[Daniel Erat, 2014/01/15 15:08:55]

nit (maybe made obsolete by sergey's comment above): this line and the next
should be indented two more spaces

[hshi1, 2014/01/15 19:43:24]

(this no longer applies)

+     configurator->SetScreenSharingCount(screen_sharing_count_);
+#endif
+   }
+
   // Cancel the request.
   if (state == content::MEDIA_REQUEST_STATE_CLOSING) {
     bool found = false;