Add switch to enable downloads backup.

Bug: 30503075
Change-Id: I011d88d16ab8677b63b73e059f0edf823cc82389

res/values/strings.xml

@@ -7764,4 +7764,10 @@
     <!-- Dropdown preference title for dropdown describing how many days of downloads to retain.-->
     <string name="automatic_storage_manager_downloads_days_title">Remove downloads</string>
 
+    <!-- Preference title for downloads backup toggle. [CHAR LIMIT=60]-->
+    <string name="downloads_backup_preference_title">Downloads backup</string>
+
+    <!-- Used as wall of text to describe the feature. [CHAR LIMIT=NONE] -->
+    <string name="downloads_backup_text"></string>
+
 </resources>

res/xml/automatic_storage_management_settings.xml

@@ -27,6 +27,10 @@
             android:title="@string/automatic_storage_manager_preference_title"
             android:summary="@string/automatic_storage_manager_text"/>
 
+        <SwitchPreference
+            android:key="downloads_backup_active"
+            android:title="@string/downloads_backup_preference_title"
+            android:summary="@string/downloads_backup_text"/>
 
         <com.android.settings.fuelgauge.WallOfTextPreference
             android:key="freed_bytes"

src/com/android/settings/deletionhelper/AutomaticStorageManagerSettings.java

@@ -55,6 +55,7 @@ public class AutomaticStorageManagerSettings extends SettingsPreferenceFragment
     private static final String KEY_DELETION_HELPER = "deletion_helper";
     private static final String KEY_FREED = "freed_bytes";
     private static final String KEY_STORAGE_MANAGER_SWITCH = "storage_manager_active";
+    private static final String KEY_DOWNLOADS_BACKUP_SWITCH = "downloads_backup_active";
     private static final String KEY_DOWNLOADS_DAYS = "downloads_days";
 
     private DropDownPreference mDaysToRetain;
@@ -62,6 +63,7 @@ public class AutomaticStorageManagerSettings extends SettingsPreferenceFragment
     private Preference mFreedBytes;
     private Preference mDeletionHelper;
     private SwitchPreference mStorageManagerSwitch;
+    private SwitchPreference mDownloadsBackupSwitch;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
@@ -86,6 +88,9 @@ public class AutomaticStorageManagerSettings extends SettingsPreferenceFragment
         mStorageManagerSwitch = (SwitchPreference) findPreference(KEY_STORAGE_MANAGER_SWITCH);
         mStorageManagerSwitch.setOnPreferenceChangeListener(this);
 
+        mDownloadsBackupSwitch = (SwitchPreference) findPreference(KEY_DOWNLOADS_BACKUP_SWITCH);
+        mDownloadsBackupSwitch.setOnPreferenceChangeListener(this);
+
         ContentResolver cr = getContentResolver();
         int photosDaysToRetain = Settings.Secure.getInt(cr,
                 Settings.Secure.AUTOMATIC_STORAGE_MANAGER_DAYS_TO_RETAIN,
@@ -120,23 +125,34 @@ public class AutomaticStorageManagerSettings extends SettingsPreferenceFragment
     @Override
     public void onResume() {
         super.onResume();
-        boolean isChecked =
+        boolean isStorageManagerChecked =
                 Settings.Secure.getInt(getContentResolver(),
                         Settings.Secure.AUTOMATIC_STORAGE_MANAGER_ENABLED, 0) != 0;
-        mStorageManagerSwitch.setChecked(isChecked);
+        mStorageManagerSwitch.setChecked(isStorageManagerChecked);
-        mDaysToRetain.setEnabled(isChecked);
+        mDaysToRetain.setEnabled(isStorageManagerChecked);
+
+        boolean isDownloadsBackupChecked =
+                Settings.Secure.getInt(getContentResolver(),
+                        Settings.Secure.DOWNLOADS_BACKUP_ENABLED, 0) != 0;
+        mDownloadsBackupSwitch.setChecked(isDownloadsBackupChecked);
     }
 
     @Override
     public boolean onPreferenceChange(Preference preference, Object newValue) {
         switch (preference.getKey()) {
             case KEY_STORAGE_MANAGER_SWITCH:
-                boolean checked = (boolean) newValue;
+                boolean storageManagerChecked = (boolean) newValue;
                 MetricsLogger.action(getContext(), MetricsEvent.ACTION_TOGGLE_STORAGE_MANAGER,
-                        checked);
+                        storageManagerChecked);
-                mDaysToRetain.setEnabled(checked);
+                mDaysToRetain.setEnabled(storageManagerChecked);
                 Settings.Secure.putInt(getContentResolver(),
-                        Settings.Secure.AUTOMATIC_STORAGE_MANAGER_ENABLED, checked ? 1 : 0);
+                        Settings.Secure.AUTOMATIC_STORAGE_MANAGER_ENABLED,
+                        storageManagerChecked ? 1 : 0);
+                break;
+            case KEY_DOWNLOADS_BACKUP_SWITCH:
+                boolean downloadsBackupChecked = (boolean) newValue;
+                Settings.Secure.putInt(getContentResolver(),
+                        Settings.Secure.DOWNLOADS_BACKUP_ENABLED, downloadsBackupChecked ? 1 : 0);
                 break;
             case KEY_DAYS:
                 Settings.Secure.putInt(getContentResolver(),