[Settings] Add preference click metric log

- Move the log point of onPreferenceTreeClick from DashboardFragment to
  it's super class InstrumentedPreferenceFragment for better coverage.
- Write the preference click metric log in PreferenceController handling
  case in DashboardFragment which will skip super class's log point.

Bug: 137559984
Test: robotest
Change-Id: I67178f613c74f755e20fc9dc41319974cb02e83c

src/com/android/settings/core/InstrumentedPreferenceFragment.java

@@ -87,6 +87,12 @@ public abstract class InstrumentedPreferenceFragment extends ObservablePreferenc
         return super.findPreference(key);
     }
 
+    @Override
+    public boolean onPreferenceTreeClick(Preference preference) {
+        writePreferenceClickMetric(preference);
+        return super.onPreferenceTreeClick(preference);
+    }
+
     protected final Context getPrefContext() {
         return getPreferenceManager().getContext();
     }
@@ -102,6 +108,10 @@ public abstract class InstrumentedPreferenceFragment extends ObservablePreferenc
         mVisibilityLoggerMixin.writeElapsedTimeMetric(action, key);
     }
 
+    protected void writePreferenceClickMetric(Preference preference) {
+        mMetricsFeatureProvider.logClickedPreference(preference, getMetricsCategory());
+    }
+
     private void updateActivityTitleWithScreenTitle(PreferenceScreen screen) {
         if (screen != null) {
             final CharSequence title = screen.getTitle();