Support fullscreen for non-video elements in the WebView.

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 8658aebb8b92cf921e280a6fe469366142dd0fe3..a5e95433ccd5afb6235db8940bdc6066f6c4fda1 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1710,9 +1710,19 @@ void RenderWidget::DidToggleFullscreen() {
     return;
 
   if (is_fullscreen_) {
+    // NOTE: for fullscreen video the ordering is important.
+    // 1. webwidget_->didEnterFullScreen() creates the ContentVideoView
+    // 2. which will be added to the window once
+    //    ViewHostMsg_DidEnterFullscreen is received.
     webwidget_->didEnterFullScreen();
+#if defined(OS_ANDROID)
+    Send(new ViewHostMsg_DidEnterFullscreen(routing_id_));
+#endif
   } else {
     webwidget_->didExitFullScreen();
+#if defined(OS_ANDROID)
+    Send(new ViewHostMsg_DidExitFullscreen(routing_id_));
+#endif
   }
 }