Make default value of auto-sync in SyncStorageEngine configurable

This will make the default value of the automatic synchronization
in the SyncStorageEngine configurable with overlays for use by
vendors who want or have legal requirements to have the synchronization
off by default.

Change-Id: Iabdb355c4a1169fe8e254e91c43e162c5913d5e0

Author: yameng

core/java/android/content/SyncStorageEngine.java

@@ -26,6 +26,7 @@
 
 import android.accounts.Account;
 import android.accounts.AccountAndUser;
+import android.content.res.Resources;
 import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteException;
@@ -337,6 +338,7 @@ interface OnSyncRequestListener {
 
     private int mNextHistoryId = 0;
     private SparseArray<Boolean> mMasterSyncAutomatically = new SparseArray<Boolean>();
+    private boolean mDefaultMasterSyncAutomatically;
 
     private OnSyncRequestListener mSyncRequestListener;
 
@@ -346,6 +348,9 @@ private SyncStorageEngine(Context context, File dataDir) {
 
         mCal = Calendar.getInstance(TimeZone.getTimeZone("GMT+0"));
 
+        mDefaultMasterSyncAutomatically = mContext.getResources().getBoolean(
+               com.android.internal.R.bool.config_syncstorageengine_masterSyncAutomatically);
+
         File systemDir = new File(dataDir, "system");
         File syncDir = new File(systemDir, "sync");
         syncDir.mkdirs();
@@ -781,7 +786,7 @@ public void setMasterSyncAutomatically(boolean flag, int userId) {
     public boolean getMasterSyncAutomatically(int userId) {
         synchronized (mAuthorities) {
             Boolean auto = mMasterSyncAutomatically.get(userId);
-            return auto == null ? true : auto;
+            return auto == null ? mDefaultMasterSyncAutomatically : auto;
         }
     }
 

core/res/res/values/config.xml

@@ -865,4 +865,7 @@
 
     <!-- Set to true to add links to Cell Broadcast app from Settings and MMS app. -->
     <bool name="config_cellBroadcastAppLinks">false</bool>
+
+    <!-- The default value if the SyncStorageEngine should sync automatically or not -->
+    <bool name="config_syncstorageengine_masterSyncAutomatically">true</bool>
 </resources>

core/res/res/values/public.xml

@@ -253,6 +253,7 @@
   <java-symbol type="bool" name="config_sms_capable" />
   <java-symbol type="bool" name="config_sms_utf8_support" />
   <java-symbol type="bool" name="config_swipeDisambiguation" />
+  <java-symbol type="bool" name="config_syncstorageengine_masterSyncAutomatically" />
   <java-symbol type="bool" name="config_telephony_use_own_number_for_voicemail" />
   <java-symbol type="bool" name="config_ui_enableFadingMarquee" />
   <java-symbol type="bool" name="config_use_strict_phone_number_comparation" />