Sync search result loaders

The loaders should be syncronized so the results can be
properly ranked without sudden insertions.

This means InstalledAppsLoader needs to finish faster,
which is accomplished by delaying icon loading to bind time
rather than as the apps are queried.

Bug: 34772522
Test: make RunSettingsRoboTests
Change-Id: I7f5244c574d37c6cfd8bbd0d3d40488f38211be3

src/com/android/settings/search2/SearchFeatureProviderImpl.java

@@ -65,13 +65,14 @@ public class SearchFeatureProviderImpl implements SearchFeatureProvider {
 
     @Override
     public DatabaseResultLoader getDatabaseSearchLoader(Context context, String query) {
-        return new DatabaseResultLoader(context, query);
+        return new DatabaseResultLoader(context, query, getSiteMapManager());
     }
 
     @Override
     public InstalledAppResultLoader getInstalledAppSearchLoader(Context context, String query) {
         return new InstalledAppResultLoader(
-                context, new PackageManagerWrapperImpl(context.getPackageManager()), query);
+                context, new PackageManagerWrapperImpl(context.getPackageManager()), query,
+                getSiteMapManager());
     }
 
     @Override