Extract colors from wallpaper and dynamically update login screen overlay

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

 // Copyright (c) 2013 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 "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <vector>
@@ skipping 999 matching lines @@
 }
 
 void SigninScreenHandler::OnCurrentScreenChanged(OobeScreen current_screen,
                                                  OobeScreen new_screen) {
   if (new_screen == OobeScreen::SCREEN_ACCOUNT_PICKER) {
     // Restore active IME state if returning to user pod row screen.
     input_method::InputMethodManager::Get()->SetState(ime_state_);
   }
 }
 
+void SigninScreenHandler::OnColorCalculationComplete() {
+  std::string dm_color;
+  std::string scroll_color;
+  std::string background_color;
+  WallpaperManager::Get()->getLoginOverlayColors(&dm_color, &scroll_color,
+                                                 &background_color);
+  WallpaperManager::Get()->SetLoginOverlayCalculatorObserver(nullptr);
+  CallJS("login.AccountPickerScreen.setOverlayColors", dm_color, scroll_color,
+         background_color);
+}
+
 void SigninScreenHandler::ClearAndEnablePassword() {
   core_oobe_view_->ResetSignInUI(false);
 }
 
 void SigninScreenHandler::ClearUserPodPassword() {
   core_oobe_view_->ClearUserPodPassword();
 }
 
 void SigninScreenHandler::RefocusCurrentPod() {
   core_oobe_view_->RefocusCurrentPod();
@@ skipping 238 matching lines @@
   gaia_screen_handler_->set_populated_email(email);
   gaia_screen_handler_->LoadAuthExtension(true /* force */, true /* offline */);
   UpdateUIState(UI_STATE_GAIA_SIGNIN, nullptr);
 }
 
 void SigninScreenHandler::HandleShutdownSystem() {
   ash::Shell::Get()->lock_state_controller()->RequestShutdown();
 }
 
 void SigninScreenHandler::HandleLoadWallpaper(const AccountId& account_id) {
-  if (delegate_)
-    delegate_->LoadWallpaper(account_id);
+  WallpaperManager::Get()->SetLoginOverlayCalculatorObserver(this);
+  WallpaperManager::Get()->SetUserWallpaperDelayed(account_id);
 }
 
 void SigninScreenHandler::HandleRebootSystem() {
   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->RequestRestart();
 }
 
 void SigninScreenHandler::HandleRemoveUser(const AccountId& account_id) {
   if (delegate_ &&
       (delegate_->IsUserSigninCompleted() || delegate_->IsSigninInProgress())) {
     return;
@@ skipping 198 matching lines @@
   focused_pod_account_id_ = base::MakeUnique<AccountId>(account_id);
 
   const user_manager::User* user =
       user_manager::UserManager::Get()->FindUser(account_id);
   // |user| may be nullptr in kiosk mode or unit tests.
   if (user && user->is_logged_in() && !user->is_active()) {
     SessionControllerClient::DoSwitchActiveUser(account_id);
   } else {
     SetUserInputMethod(account_id.GetUserEmail(), ime_state_.get());
     SetKeyboardSettings(account_id);
+    WallpaperManager::Get()->SetLoginOverlayCalculatorObserver(this);
     WallpaperManager::Get()->SetUserWallpaperDelayed(account_id);
 
     bool use_24hour_clock = false;
     if (user_manager::known_user::GetBooleanPref(
             account_id, prefs::kUse24HourClock, &use_24hour_clock)) {
       g_browser_process->platform_part()
           ->GetSystemClock()
           ->SetLastFocusedPodHourClockType(
               use_24hour_clock ? base::k24HourClock : base::k12HourClock);
     }
@@ skipping 199 matching lines @@
   rate.initial_delay_in_ms = auto_repeat_delay;
   rate.repeat_interval_in_ms = auto_repeat_interval;
   input_method::InputMethodManager::Get()
       ->GetImeKeyboard()
       ->SetAutoRepeatEnabled(true);
   input_method::InputMethodManager::Get()->GetImeKeyboard()->SetAutoRepeatRate(
       rate);
 }
 
 }  // namespace chromeos