Merge "Use MotionEvent#isStylusPointer in initiator"

            case MotionEvent.ACTION_DOWN:

            case MotionEvent.ACTION_POINTER_DOWN:

                mState = null;

                final int actionIndex = motionEvent.getActionIndex();

                final int toolType = motionEvent.getToolType(actionIndex);

                // TOOL_TYPE_ERASER is also from stylus. This indicates that the user is holding

                // the eraser button during handwriting.

                if (toolType != MotionEvent.TOOL_TYPE_STYLUS

                        && toolType != MotionEvent.TOOL_TYPE_ERASER) {

                if (!motionEvent.isStylusPointer()) {

                    // The motion event is not from a stylus event, ignore it.

                    return false;

                }