Propagate media play/pause to WebContentsObserver for Chromecast metrics

chromecast/browser/cast_content_window.cc

Index: chromecast/browser/cast_content_window.cc
diff --git a/chromecast/browser/cast_content_window.cc b/chromecast/browser/cast_content_window.cc
index b813e9175dcd19bd40855ea64ce0adfb10a9237a..27c91b74cb4b36c16004b8fd2441865711f040c3 100644
--- a/chromecast/browser/cast_content_window.cc
+++ b/chromecast/browser/cast_content_window.cc
@@ -119,4 +119,12 @@ void CastContentWindow::DidFirstVisuallyNonEmptyPaint() {
   metrics::CastMetricsHelper::GetInstance()->LogTimeToFirstPaint();
 }
 
+void CastContentWindow::MediaPaused() {
+  metrics::CastMetricsHelper::GetInstance()->LogMediaPause();
+}
+
+void CastContentWindow::MediaStartedPlaying() {
+  metrics::CastMetricsHelper::GetInstance()->LogMediaPlay();
+}
+
 }  // namespace chromecast