cros: Allow JS to control virtual keyboard on sign-in screen.

chrome/browser/chromeos/login/ui/webui_login_view.cc

Index: chrome/browser/chromeos/login/ui/webui_login_view.cc
diff --git a/chrome/browser/chromeos/login/ui/webui_login_view.cc b/chrome/browser/chromeos/login/ui/webui_login_view.cc
index 1dcb1fc9f02695cbd462f1aaee87bd26c38f5cde..6d254018e1ad31fe9f43abf85ed0f05c08f0007e 100644
--- a/chrome/browser/chromeos/login/ui/webui_login_view.cc
+++ b/chrome/browser/chromeos/login/ui/webui_login_view.cc
@@ -54,6 +54,7 @@
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
+#include "ui/keyboard/keyboard_controller.h"
 #include "ui/views/controls/webview/webview.h"
 #include "ui/views/widget/widget.h"
 
@@ -111,6 +112,12 @@ const char WebUILoginView::kViewClassName[] =
 
 WebUILoginView::WebUILoginView(const WebViewSettings& settings)
     : settings_(settings) {
+  if (keyboard::KeyboardController::GetInstance()) {
+    keyboard::KeyboardController::GetInstance()->AddObserver(this);
+    is_observing_keyboard_ = true;
+  }
+  ash::Shell::Get()->AddShellObserver(this);
+
   registrar_.Add(this,
                  chrome::NOTIFICATION_LOGIN_OR_LOCK_WEBUI_VISIBLE,
                  content::NotificationService::AllSources());
@@ -171,6 +178,12 @@ WebUILoginView::~WebUILoginView() {
   for (auto& observer : observer_list_)
     observer.OnHostDestroying();
 
+  ash::Shell::Get()->RemoveShellObserver(this);
+  if (keyboard::KeyboardController::GetInstance() && is_observing_keyboard_) {
+    keyboard::KeyboardController::GetInstance()->RemoveObserver(this);
+    is_observing_keyboard_ = false;
+  }
+
   if (!ash_util::IsRunningInMash() &&
       ash::Shell::Get()->HasPrimaryStatusArea()) {
     ash::Shell::Get()->GetPrimarySystemTray()->SetNextFocusableView(nullptr);
@@ -406,6 +419,45 @@ views::WebView* WebUILoginView::web_view() {
   return webui_login_.get();
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// ash::ShellObserver:
+
+void WebUILoginView::OnVirtualKeyboardStateChanged(bool activated,
+                                                   ash::WmWindow* root_window) {
+  if (keyboard::KeyboardController::GetInstance()) {

[achuithb, 2017/04/12 19:00:26]

Let's use a temp var for this?

[jdufault, 2017/04/13 00:34:42]

Done.

+    if (activated) {
+      if (!is_observing_keyboard_) {
+        keyboard::KeyboardController::GetInstance()->AddObserver(this);
+        is_observing_keyboard_ = true;

[achuithb, 2017/04/12 19:00:26]

Is the purpose of is_observing_keyboard_ just to prevent double insertion into
KeyboardController's ObserverList? We could just use HasObserver instead:
auto keyboard_controller = keyboard::KeyboardController::GetInstance();
if (!keyboard_controller->HasObserver(this))
  keyboard_controller->AddObserver(this);

[jdufault, 2017/04/13 00:34:42]

Done.

+      }
+    } else {
+      keyboard::KeyboardController::GetInstance()->RemoveObserver(this);
+      is_observing_keyboard_ = false;
+    }
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// keyboard::KeyboardControllerObserver:
+
+void WebUILoginView::OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) {
+  if (new_bounds.IsEmpty()) {
+    // Keyboard has been hidden.
+    if (GetOobeUI()) {
+      GetOobeUI()->GetCoreOobeView()->ShowControlBar(true);

[achuithb, 2017/04/12 19:00:26]

Use a temp var for this?

CoreOobeView* core_oobe_view = GetOobeUI() ? GetOObeUI()->GetCoreOobeView() :
nullptr;

[jdufault, 2017/04/13 00:34:42]

Done.

+      GetOobeUI()->GetCoreOobeView()->SetVirtualKeyboardShown(false);
+    }
+  } else {
+    // Keyboard has been shown.
+    if (GetOobeUI()) {
+      GetOobeUI()->GetCoreOobeView()->ShowControlBar(false);
+      GetOobeUI()->GetCoreOobeView()->SetVirtualKeyboardShown(true);
+    }
+  }
+}
+
+void WebUILoginView::OnKeyboardClosed() {}
+
 // WebUILoginView private: -----------------------------------------------------
 
 bool WebUILoginView::HandleContextMenu(