Add --keyboard-usability-test flag and always show keyboard unless manually hide

ash/shell.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/shell.h"
 
 #include <algorithm>
 #include <string>
 
 #include "ash/accelerators/accelerator_controller.h"
@@ skipping 319 matching lines @@
   }
   FOR_EACH_OBSERVER(ShellObserver, observers_,
                     OnDisplayWorkAreaInsetsChanged());
 }
 
 void Shell::OnLoginStateChanged(user::LoginStatus status) {
   if (status != user::LOGGED_IN_NONE) {
     // TODO(bshe): Primary root window controller may not be the controller to
     // attach virtual keyboard. See http://crbug.com/303429
     InitKeyboard(GetPrimaryRootWindowController());
+    GetPrimaryRootWindowController()->ActivateKeyboard(
+        keyboard_controller_.get());
   }
   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLoginStateChanged(status));
 }
 
 void Shell::UpdateAfterLoginStatusChange(user::LoginStatus status) {
   RootWindowControllerList controllers = GetAllRootWindowControllers();
   for (RootWindowControllerList::iterator iter = controllers.begin();
        iter != controllers.end(); ++iter)
     (*iter)->UpdateAfterLoginStatusChange(status);
 }
@@ skipping 553 matching lines @@
       RootWindowControllerList controllers = GetAllRootWindowControllers();
       for (RootWindowControllerList::iterator iter = controllers.begin();
            iter != controllers.end(); ++iter) {
         (*iter)->DeactivateKeyboard(keyboard_controller_.get());
       }
     }
     keyboard::KeyboardControllerProxy* proxy =
         delegate_->CreateKeyboardControllerProxy();
     keyboard_controller_.reset(
         new keyboard::KeyboardController(proxy));
-    root->ActivateKeyboard(keyboard_controller_.get());
   }
 }
 
 void Shell::InitRootWindow(aura::RootWindow* root_window) {
   DCHECK(activation_client_);
   DCHECK(visibility_controller_.get());
   DCHECK(drag_drop_controller_.get());
   DCHECK(window_cycle_controller_.get());
 
   aura::client::SetFocusClient(root_window, focus_client_.get());
@@ skipping 47 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // Shell, aura::client::ActivationChangeObserver implementation:
 
 void Shell::OnWindowActivated(aura::Window* gained_active,
                               aura::Window* lost_active) {
   if (gained_active)
     target_root_window_ = gained_active->GetRootWindow();
 }
 
 }  // namespace ash