Notify the Chrome browser process about the window being activated from the viewer process.

ui/aura/remote_window_tree_host_win.cc

Index: ui/aura/remote_window_tree_host_win.cc
diff --git a/ui/aura/remote_window_tree_host_win.cc b/ui/aura/remote_window_tree_host_win.cc
index 06c0aeed87a209884dd0bb4af7faa8d2cd7903de..ad2f8fed53e1980edd0ba1a264f430ea3794805d 100644
--- a/ui/aura/remote_window_tree_host_win.cc
+++ b/ui/aura/remote_window_tree_host_win.cc
@@ -379,6 +379,8 @@ void RemoteWindowTreeHostWin::OnChar(uint32 key_code,
 
 void RemoteWindowTreeHostWin::OnWindowActivated() {
   OnHostActivated();
+  if (compositor())

[sky, 2014/09/04 18:57:37]

Why do we need a full redraw on activation?

[ananta, 2014/09/04 19:02:19]

On Windows 7 the metro window can be minimized by clicking on the taskbar
button. When we restore it back the window does not paint. On Windows 8 this is
a non issue.

Alternatively we can send in a bool in the IPC which defaults to false. For Win7
we can pass that as true. This bool would indicate if the window needs to be
redrawn.

+    compositor()->ScheduleFullRedraw();
 }
 
 void RemoteWindowTreeHostWin::OnEdgeGesture() {