Bug 1064177 - Part 2: Don't show Synced Tabs home panel in Guest Mode. r=wesj

We hard-code a number of default panel configuration options here, so
let's add another.

I don't care to migrate serialized Guest profile Home Panel
configurations forward.  I don't expect there are any: no Home Panel
configuration is written to SharedPreferences until the user edits the
default configuration in Settings > Customize > Home, and I expect ~0
folks to have taken these steps while in Guest Mode.

While I was here, I updated the other uses of GeckoProfile.inGuestMode
to guard Sync related things that I found.

--HG--
extra : rebase_source : 995a70fb19abbd1958e84f2517bd864ffdf75584

mobile/android/base/home/HomeConfigPrefsBackend.java

@@ -15,6 +15,7 @@ import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 import org.mozilla.gecko.GeckoSharedPrefs;
+import org.mozilla.gecko.RestrictedProfiles;
 import org.mozilla.gecko.home.HomeConfig.HomeConfigBackend;
 import org.mozilla.gecko.home.HomeConfig.OnReloadListener;
 import org.mozilla.gecko.home.HomeConfig.PanelConfig;
@@ -81,19 +82,30 @@ class HomeConfigPrefsBackend implements HomeConfigBackend {
 
         final PanelConfig historyEntry = createBuiltinPanelConfig(mContext, PanelType.HISTORY);
         final PanelConfig recentTabsEntry = createBuiltinPanelConfig(mContext, PanelType.RECENT_TABS);
-        final PanelConfig remoteTabsEntry = createBuiltinPanelConfig(mContext, PanelType.REMOTE_TABS);
+
+        // We disable Synced Tabs for guest mode profiles.
+        final PanelConfig remoteTabsEntry;
+        if (RestrictedProfiles.isAllowed(RestrictedProfiles.Restriction.DISALLOW_MODIFY_ACCOUNTS)) {
+            remoteTabsEntry = createBuiltinPanelConfig(mContext, PanelType.REMOTE_TABS);
+        } else {
+            remoteTabsEntry = null;
+        }
 
         // On tablets, we go [...|History|Recent Tabs|Synced Tabs].
         // On phones, we go [Synced Tabs|Recent Tabs|History|...].
         if (HardwareUtils.isTablet()) {
             panelConfigs.add(historyEntry);
             panelConfigs.add(recentTabsEntry);
+            if (remoteTabsEntry != null) {
                 panelConfigs.add(remoteTabsEntry);
+            }
         } else {
             panelConfigs.add(0, historyEntry);
             panelConfigs.add(0, recentTabsEntry);
+            if (remoteTabsEntry != null) {
                 panelConfigs.add(0, remoteTabsEntry);
             }
+        }
 
         return new State(panelConfigs, true);
     }

mobile/android/base/preferences/GeckoPreferences.java

@@ -29,6 +29,7 @@ import org.mozilla.gecko.LocaleManager;
 import org.mozilla.gecko.NewTabletUI;
 import org.mozilla.gecko.PrefsHelper;
 import org.mozilla.gecko.R;
+import org.mozilla.gecko.RestrictedProfiles;
 import org.mozilla.gecko.Telemetry;
 import org.mozilla.gecko.TelemetryContract;
 import org.mozilla.gecko.TelemetryContract.Method;
@@ -717,7 +718,8 @@ OnSharedPreferenceChangeListener
                     CharSequence selectedEntry = listPref.getEntry();
                     listPref.setSummary(selectedEntry);
                     continue;
-                } else if (PREFS_SYNC.equals(key) && GeckoProfile.get(this).inGuestMode()) {
+                } else if (PREFS_SYNC.equals(key) &&
+                           !RestrictedProfiles.isAllowed(RestrictedProfiles.Restriction.DISALLOW_MODIFY_ACCOUNTS)) {
                     // Don't show sync prefs while in guest mode.
                     preferences.removePreference(pref);
                     i--;

mobile/android/base/tabs/TabsPanel.java

@@ -15,6 +15,7 @@ import org.mozilla.gecko.LightweightTheme;
 import org.mozilla.gecko.LightweightThemeDrawable;
 import org.mozilla.gecko.NewTabletUI;
 import org.mozilla.gecko.R;
+import org.mozilla.gecko.RestrictedProfiles;
 import org.mozilla.gecko.Telemetry;
 import org.mozilla.gecko.TelemetryContract;
 import org.mozilla.gecko.animation.PropertyAnimator;
@@ -173,7 +174,7 @@ public class TabsPanel extends LinearLayout
         mTabWidget.addTab(R.drawable.tabs_normal, R.string.tabs_normal);
         mTabWidget.addTab(R.drawable.tabs_private, R.string.tabs_private);
 
-        if (!GeckoProfile.get(mContext).inGuestMode()) {
+        if (RestrictedProfiles.isAllowed(RestrictedProfiles.Restriction.DISALLOW_MODIFY_ACCOUNTS)) {
             // The initial icon is not the animated icon, because on Android
             // 4.4.2, the animation starts immediately (and can start at other
             // unpredictable times). See Bug 1015974.