Add ability to switch between support versions

Creates a trampoline activity and adds functionality
to the SupportFeatureProvider interface so that we can
conditionally launch support V1 or V2.

Test: Test in ag/2144016
Bug: 37306241
Change-Id: I6d24e65cad91692e457ea216713e90239845b4f5

src/com/android/settings/overlay/SupportFeatureProvider.java

@@ -128,6 +128,19 @@ public interface SupportFeatureProvider {
      */
     void startSupport(Activity activity, Account account, @SupportType int type);
 
+    /**
+     * Starts support v2, invokes the support home page. Will no-op if support v2 is not enabled.
+     *
+     * @param activity Calling activity.
+     */
+    void startSupportV2(Activity activity);
+
+    /**
+     * Checks if support v2 is enabled for this device.
+     * @return a boolean indicating if support v2 is enabled.
+     */
+    boolean isSupportV2Enabled();
+
     /**
      * Returns an {@link Intent} that opens help and allow user get help on sign in.
      */