Extract colors from wallpaper and dynamically update login screen overlay

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

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 12 matching lines @@
 #include "chrome/browser/chromeos/login/signin_specifics.h"
 #include "chrome/browser/chromeos/login/ui/login_display.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/ui/webui/chromeos/login/base_webui_handler.h"
 #include "chrome/browser/ui/webui/chromeos/login/network_state_informer.h"
 #include "chrome/browser/ui/webui/chromeos/login/oobe_ui.h"
 #include "chromeos/dbus/power_manager_client.h"
 #include "chromeos/network/portal_detector/network_portal_detector.h"
 #include "components/proximity_auth/screenlock_bridge.h"
 #include "components/user_manager/user_manager.h"
+#include "components/wallpaper/wallpaper_color_calculator_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_ui.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "net/base/net_errors.h"
 #include "ui/base/ime/chromeos/ime_keyboard.h"
 #include "ui/base/ime/chromeos/input_method_manager.h"
 #include "ui/events/event_handler.h"
 
 class AccountId;
@@ skipping 189 matching lines @@
 // LoginDisplay.
 class SigninScreenHandler
     : public BaseWebUIHandler,
       public LoginDisplayWebUIHandler,
       public content::NotificationObserver,
       public NetworkStateInformer::NetworkStateInformerObserver,
       public PowerManagerClient::Observer,
       public input_method::ImeKeyboard::Observer,
       public ash::mojom::TouchViewObserver,
       public lock_screen_apps::StateObserver,
-      public OobeUI::Observer {
+      public OobeUI::Observer,
+      public wallpaper::WallpaperColorCalculatorObserver {
  public:
   SigninScreenHandler(
       const scoped_refptr<NetworkStateInformer>& network_state_informer,
       ErrorScreen* error_screen,
       CoreOobeView* core_oobe_view,
       GaiaScreenHandler* gaia_screen_handler,
       JSCallsContainer* js_calls_container);
   ~SigninScreenHandler() override;
 
   static std::string GetUserLastInputMethod(const std::string& username);
@@ skipping 17 matching lines @@
   void OnNetworkReady() override;
   void UpdateState(NetworkError::ErrorReason reason) override;
 
   // Required Local State preferences.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
   // OobeUI::Observer implemetation.
   void OnCurrentScreenChanged(OobeScreen current_screen,
                               OobeScreen new_screen) override;
 
+  // wallpaper::WallpaperColorCalculatorObserver implementation.
+  void OnColorCalculationComplete() override;
+
   void SetFocusPODCallbackForTesting(base::Closure callback);
 
   // To avoid spurious error messages on flaky networks, the offline message is
   // only shown if the network is offline for a threshold number of seconds.
   // This method reduces the threshold to zero, allowing the offline message to
   // show instantaneously in tests.
   void ZeroOfflineTimeoutForTesting();
 
   // Gets the keyboard remapped pref value for |pref_name| key. Returns true if
   // successful, otherwise returns false.
@@ skipping 268 matching lines @@
       lock_screen_apps_observer_;
 
   base::WeakPtrFactory<SigninScreenHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_