Merge "Require both fingers to move before starting two-finger passthrough."

                    if (pointerIndex < 0) {

                        return;

                    }

                    // Require both fingers to have moved a certain amount before starting a drag.

                    for (int index = 0; index < event.getPointerCount(); ++index) {

                        int id = event.getPointerId(index);

                        if (!mReceivedPointerTracker.isReceivedPointerDown(id)) {

                            // Something is wrong with the event stream.

                            Slog.e(LOG_TAG, "Invalid pointer id: " + id);

                        }

                        final float deltaX =

                            mReceivedPointerTracker.getReceivedPointerDownX(pointerId)

                                    - rawEvent.getX(pointerIndex);

                                mReceivedPointerTracker.getReceivedPointerDownX(id)

                                        - rawEvent.getX(index);

                        final float deltaY =

                            mReceivedPointerTracker.getReceivedPointerDownY(pointerId)

                                    - rawEvent.getY(pointerIndex);

                                mReceivedPointerTracker.getReceivedPointerDownY(id)

                                        - rawEvent.getY(index);

                        final double moveDelta = Math.hypot(deltaX, deltaY);

                        if (moveDelta < mTouchSlop) {

                            return;

                        }

                    }

                }

                // More than one pointer so the user is not touch exploring

                // and now we have to decide whether to delegate or drag.

                // Remove move history before send injected non-move events