Fix NPE / add downX,Y location for all swipes/ add extra debugging info

Bug: 122700646
Bug: 127840207

Change-Id: I5862c8950565df172a933114e1fb2f9c4575593e

src/com/android/launcher3/touch/AbstractStateChangeTouchController.java

@@ -540,7 +540,7 @@ public abstract class AbstractStateChangeTouchController
     private void logReachedState(int logAction, LauncherState targetState) {
         // Transition complete. log the action
         mLauncher.getUserEventDispatcher().logStateChangeAction(logAction,
-                getDirectionForLog(),
+                getDirectionForLog(), mDetector.getDownX(), mDetector.getDownY(),
                 mStartContainerType,
                 mStartState.containerType,
                 targetState.containerType,