Only show virtual keyboard on primary root window

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 49ce6b89f89ab2d10e90b6fb5f1c2c68a7e9bda2..8cbb3b4939d3af15532635198aaf2f23b97ffe1a 100644
--- a/ash/root_window_controller.h
+++ b/ash/root_window_controller.h
@@ -102,10 +102,6 @@ class ASH_EXPORT RootWindowController : public ShellObserver {
     return always_on_top_controller_.get();
   }
 
-  keyboard::KeyboardController* keyboard_controller() {
-    return keyboard_controller_.get();
-  }
-
   ScreenDimmer* screen_dimmer() { return screen_dimmer_.get(); }
 
   // Access the shelf associated with this root window controller,
@@ -214,6 +210,12 @@ class ASH_EXPORT RootWindowController : public ShellObserver {
   // windows are in fullscreen state, the topmost one is preferred.
   const aura::Window* GetTopmostFullscreenWindow() const;
 
+  // Enable virtual keyboard on current root window controller.
+  void EnableKeyboard(keyboard::KeyboardController* keyboard_controller);
+
+  // Disable virtual keyboard on current root window controller.
+  void DisableKeyboard(keyboard::KeyboardController* keyboard_controller);
+
  private:
   void InitLayoutManagers();
 
@@ -225,9 +227,6 @@ class ASH_EXPORT RootWindowController : public ShellObserver {
   // types in the shell UI.
   void CreateContainersInRootWindow(aura::RootWindow* root_window);
 
-  // Initializes the virtual keyboard.
-  void InitKeyboard();
-
   // Enables projection touch HUD.
   void EnableTouchHudProjection();
 
@@ -243,8 +242,6 @@ class ASH_EXPORT RootWindowController : public ShellObserver {
 
   scoped_ptr<StackingController> stacking_controller_;
 
-  scoped_ptr<keyboard::KeyboardController> keyboard_controller_;
-
   // The shelf for managing the launcher and the status widget.
   scoped_ptr<ShelfWidget> shelf_;