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

chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc

Index: chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
diff --git a/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc b/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
index a4ad3490aa44bb4a8e642bb12d8a2df788cad584..d021e0cc35afed672f6f25ff6744f9d428855163 100644
--- a/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
+++ b/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.h"
 
+#include "ash/root_window_controller.h"
 #include "ash/session_state_delegate.h"
 #include "ash/shell.h"
 #include "base/command_line.h"
@@ -88,9 +89,15 @@ void ChromeBrowserMainExtraPartsAsh::PreProfileInit() {
 }
 
 void ChromeBrowserMainExtraPartsAsh::PostProfileInit() {
+  if (!ash::Shell::HasInstance())
+    return;
+
   // Initialize TabScrubber after the Ash Shell has been initialized.
-  if (ash::Shell::HasInstance())
-    TabScrubber::GetInstance();
+  TabScrubber::GetInstance();
+  // Activate virtual keyboard after profile is initialized. It depends on the
+  // default profile.
+  ash::Shell::GetPrimaryRootWindowController()->ActivateKeyboard(
+      ash::Shell::GetInstance()->keyboard_controller());
 }
 
 void ChromeBrowserMainExtraPartsAsh::PostMainMessageLoopRun() {