Add a suggestion: showing new device features

- New suggestion activity
- Removed useless api SuggestionFeatureProvider.isPresent().

- Also updated support activity search indexing icon and summary

Change-Id: Ib52cf26a985f57bf0aac918606b10f75bd024639
Fix: 62034077
Fix: 62196070
Test: make RunSettingsRoboTests

src/com/android/settings/dashboard/suggestions/SuggestionFeatureProvider.java

@@ -18,6 +18,7 @@ package com.android.settings.dashboard.suggestions;
 
 import android.content.ComponentName;
 import android.content.Context;
+import android.content.SharedPreferences;
 import android.support.annotation.NonNull;
 
 import com.android.settingslib.drawer.Tile;
@@ -33,12 +34,14 @@ public interface SuggestionFeatureProvider {
      */
     boolean isSmartSuggestionEnabled(Context context);
 
-    /** Return true if {@code suggestion} is managed by this provider. */
-    boolean isPresent(@NonNull ComponentName suggestion);
-
     /** Return true if the suggestion has already been completed and does not need to be shown */
     boolean isSuggestionCompleted(Context context, @NonNull ComponentName suggestion);
 
+    /**
+     * Returns the {@link SharedPreferences} that holds metadata for suggestions.
+     */
+    SharedPreferences getSharedPrefs(Context context);
+
     /**
      * Ranks the list of suggestions in place.
      *