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
diff --git a/src/com/android/settings/Settings.java b/src/com/android/settings/Settings.java
index 1db185e..5aee7bf 100644
--- a/src/com/android/settings/Settings.java
+++ b/src/com/android/settings/Settings.java
@@ -168,6 +168,7 @@
         }
     }
     public static class WebViewAppPickerActivity extends SettingsActivity { /* empty */ }
+    public static class LegacySupportActivity extends SettingsActivity{ /* empty */ }
 
     // Top level categories for new IA
     public static class NetworkDashboardActivity extends SettingsActivity {}
@@ -176,6 +177,5 @@
     public static class StorageDashboardActivity extends SettingsActivity {}
     public static class UserAndAccountDashboardActivity extends SettingsActivity {}
     public static class SystemDashboardActivity extends SettingsActivity {}
-    public static class SupportDashboardActivity extends SettingsActivity {}
 
 }