Add in gesture for immersive mode

ash/root_window_controller.h

Index: ash/root_window_controller.h
diff --git a/ash/root_window_controller.h b/ash/root_window_controller.h
index 1bd6ae8ca0610c05cc1da4f7c449faef7ac90fd0..bc8785eccd95a1be3df7acf35ac0d76e9b8a6712 100644
--- a/ash/root_window_controller.h
+++ b/ash/root_window_controller.h
@@ -173,6 +173,11 @@ class ASH_EXPORT RootWindowController {
   // so clients of Ash don't need to know the details of workspace management.
   bool IsImmersiveMode() const;
 
+  // Sets kPendingImmersiveGestureKey if the active workspace is in immersive
+  // mode. Exposed here so clients of Ash don't need to know the details of
+  // workspace management.
+  void SetPendingImmersiveGesture(bool value);

[James Cook, 2013/04/22 18:19:28]

This doesn't feel like it belongs in the RootWindowController. In fact, Peter
just removed the IsImmersiveMode() function above and I think we can remove the
kImmersiveMode window property key.  Can this be wired to call up through the
ChromeShellDelegate and query immersive mode from there?

[rharrison, 2013/04/22 18:36:52]

I suspect so, I will have to look into it.

+
  private:
   // Creates each of the special window containers that holds windows of various
   // types in the shell UI.