Support click metrics logs in several pages

- Assign metrics category to perferences at an earlier stage in
  DashboardFragment for better usability.

Bug: 137559984
Test: robotest
Change-Id: Icd4185efa0e655be20c4b673a1380fa42140923f

src/com/android/settings/location/LocationServicePreferenceController.java

@@ -58,7 +58,7 @@ public class LocationServicePreferenceController extends LocationBasePreferenceC
     @Override
     public void init(DashboardFragment fragment) {
         super.init(fragment);
-        mInjector = new AppSettingsInjector(mContext);
+        mInjector = new AppSettingsInjector(mContext, getMetricsCategory());
     }
 
     @Override