Pin keyboard works with virtual keyboard.

chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc b/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc
index 1d206def8a6538b699731c0e5f1ee0a51f4ea1d9..b48bc654dfca8f9a42a9ca354a11e833daedc7ed 100644
--- a/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.cc
@@ -275,6 +275,10 @@ void CoreOobeHandler::ShowControlBar(bool show) {
   CallJSOrDefer("showControlBar", show);
 }
 
+void CoreOobeHandler::ShowPinKeyboard(bool show) {
+  CallJSOrDefer("showPinKeyboard", show);

[jdufault, 2016/08/19 17:28:18]

Will this cause the PIN keyboard to show up when it should not? For example, I
timeout PIN from too many attempts, and then show/hide the virtual keyboard.

[sammiequon, 2016/08/23 17:28:11]

Yes, as mentioned we will delete the pin keyboard after too many bad attempts,
so nothing can show it until locked again.

+}
+
 void CoreOobeHandler::SetClientAreaSize(int width, int height) {
   CallJSOrDefer("setClientAreaSize", width, height);
 }
@@ -440,6 +444,7 @@ void CoreOobeHandler::UpdateKeyboardState() {
   if (keyboard_controller) {
     gfx::Rect bounds = keyboard_controller->current_keyboard_bounds();
     ShowControlBar(bounds.IsEmpty());
+    ShowPinKeyboard(bounds.IsEmpty());
   }
 }