Merge "Fix possible crash in System UI" into klp-dev

packages/Keyguard/src/com/android/keyguard/PagedView.java

@@ -1556,6 +1556,9 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
             if (mTouchState == TOUCH_STATE_SCROLLING) {
                 final int activePointerId = mActivePointerId;
                 final int pointerIndex = ev.findPointerIndex(activePointerId);
+
+                if (pointerIndex == -1) return true;
+
                 final float x = ev.getX(pointerIndex);
                 final VelocityTracker velocityTracker = mVelocityTracker;
                 velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);