Initial commit of 3 button work

Home, Back and Recents basic functionality working

Fixes: 180046394
Change-Id: Ifc5c767e35e88183500d14d14736eb40df436369

quickstep/src/com/android/quickstep/TouchInteractionService.java

@@ -259,6 +259,7 @@ public class TouchInteractionService extends Service implements PluginListener<O
     };
 
     private static boolean sConnected = false;
+    private static TouchInteractionService sInstance;
     private static boolean sIsInitialized = false;
     private RotationTouchHelper mRotationTouchHelper;
 
@@ -266,6 +267,11 @@ public class TouchInteractionService extends Service implements PluginListener<O
         return sConnected;
     }
 
+    @Nullable
+    public static TouchInteractionService getInstance() {
+        return sInstance;
+    }
+
     public static boolean isInitialized() {
         return sIsInitialized;
     }
@@ -293,6 +299,10 @@ public class TouchInteractionService extends Service implements PluginListener<O
 
     private DisplayManager mDisplayManager;
 
+    public TouchInteractionService() {
+        sInstance = this;
+    }
+
     @Override
     public void onCreate() {
         super.onCreate();
@@ -389,6 +399,10 @@ public class TouchInteractionService extends Service implements PluginListener<O
         onOverviewTargetChange(mOverviewComponentObserver.isHomeAndOverviewSame());
     }
 
+    public OverviewCommandHelper getOverviewCommandHelper() {
+        return mOverviewCommandHelper;
+    }
+
     private void resetHomeBounceSeenOnQuickstepEnabledFirstTime() {
         if (!mDeviceState.isUserUnlocked() || mDeviceState.isButtonNavMode()) {
             // Skip if not yet unlocked (can't read user shared prefs) or if the current navigation