ash/immersive mode: Hide the launcher when entering immersive mode

ash/shell_delegate.h

Index: ash/shell_delegate.h
diff --git a/ash/shell_delegate.h b/ash/shell_delegate.h
index bdd3958045e8d6c58d423c81154b15afbc51262b..48701d1ad13db8d03f5beafd0ad9075ed1fae68d 100644
--- a/ash/shell_delegate.h
+++ b/ash/shell_delegate.h
@@ -159,6 +159,9 @@ class ASH_EXPORT ShellDelegate {
   // accessibility features are disabled.
   virtual bool ShouldAlwaysShowAccessibilityMenu() const = 0;
 
+  // Returns true if the active browser window is in immersive mode.
+  virtual bool IsImmersiveMode() const = 0;

[sky, 2013/01/09 22:24:38]

Could we instead use a property on the window for this? Such an approach is less
invasive and more in line with how we deal with similar things (such as full
screen).

+
   // Invoked to create an AppListViewDelegate. Shell takes the ownership of
   // the created delegate.
   virtual app_list::AppListViewDelegate* CreateAppListViewDelegate() = 0;