arc-bridge: Introduce the ArcService class

chrome/browser/chromeos/arc/arc_settings_bridge_impl.h

-// Copyright (c) 2015 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_CHROMEOS_ARC_ARC_SETTINGS_BRIDGE_IMPL_H_
-#define CHROME_BROWSER_CHROMEOS_ARC_ARC_SETTINGS_BRIDGE_IMPL_H_
-
-#include <string>
-
-#include "base/gtest_prod_util.h"
-#include "base/macros.h"
-#include "base/prefs/pref_change_registrar.h"
-#include "base/values.h"
-#include "chromeos/settings/timezone_settings.h"
-#include "components/arc/arc_bridge_service.h"
-#include "components/arc/settings/arc_settings_bridge.h"
-
-namespace arc {
-
-namespace fontsizes {
-
-// The following values were obtained from chrome://settings and Android's
-// Display settings on Nov 2015. They are expected to remain stable.
-const float kAndroidFontScaleSmall = 0.85;
-const float kAndroidFontScaleNormal = 1;
-const float kAndroidFontScaleLarge = 1.15;
-const float kAndroidFontScaleHuge = 1.3;
-const int kChromeFontSizeNormal = 16;
-const int kChromeFontSizeLarge = 20;
-const int kChromeFontSizeVeryLarge = 24;
-
-// Android has only a single float value for system-wide font size
-// (font_scale).  Chrome has three main int pixel values that affect
-// system-wide font size.  We will take the largest font value of the three
-// main font values on Chrome and convert to an Android size.
-double ConvertFontSizeChromeToAndroid(int default_size,
-                                      int default_fixed_size,
-                                      int minimum_size);
-
-}  // namespace fontsizes
-
-// Listens to changes for select Chrome settings (prefs) that Android cares
-// about and sends the new values to Android to keep the state in sync.
-class ArcSettingsBridgeImpl
-    : public ArcSettingsBridge,
-      public ArcBridgeService::Observer,
-      public chromeos::system::TimezoneSettings::Observer {
- public:
-  ArcSettingsBridgeImpl() = default;
-
-  ~ArcSettingsBridgeImpl() override;
-
-  // Starts listening to state changes of the ArcBridgeService.
-  // This must be called before the bridge service starts bootstrapping.
-  void StartObservingBridgeServiceChanges() override;
-
-  // Called when a Chrome pref we have registered an observer for has changed.
-  // Obtains the new pref value and sends it to Android.
-  void OnPrefChanged(const std::string& pref_name) const;
-
-  // ArcBridgeService::Observer
-  void OnStateChanged(ArcBridgeService::State state) override;
-  void OnSettingsInstanceReady() override;
-
-  // TimezoneSettings::Observer
-  void TimezoneChanged(const icu::TimeZone& timezone) override;
-
- private:
-  // Registers to observe changes for Chrome settings we care about.
-  void StartObservingSettingsChanges();
-
-  // Stops listening for Chrome settings changes.
-  void StopObservingSettingsChanges();
-
-  // Retrives Chrome's state for the settings and send it to Android.
-  void SyncAllPrefs() const;
-  void SyncFontSize() const;
-  void SyncLocale() const;
-  void SyncSpokenFeedbackEnabled() const;
-  void SyncTimeZone() const;
-
-  // Registers to listen to a particular perf.
-  void AddPrefToObserve(const std::string& pref_name);
-
-  // Returns the integer value of the pref.  pref_name must exist.
-  int GetIntegerPref(const std::string& pref_name) const;
-
-  // Sends a broadcast to the ArcSettings app in Android.
-  void SendSettingsBroadcast(const std::string& action,
-                             const base::DictionaryValue& extras) const;
-
-  // Manages pref observation registration.
-  PrefChangeRegistrar registrar_;
-
-  DISALLOW_COPY_AND_ASSIGN(ArcSettingsBridgeImpl);
-};
-
-}  // namespace arc
-
-#endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_SETTINGS_BRIDGE_IMPL_H_