Add better information for invalid path

import android.animation.Animator;

import android.content.Context;

import android.util.Log;

import android.view.ViewPropertyAnimator;

import android.view.animation.Interpolator;

import android.view.animation.PathInterpolator;

import com.android.systemui.Interpolators;

import com.android.systemui.statusbar.notification.NotificationUtils;

import com.android.systemui.statusbar.phone.StatusBar;

/**

 * Utility class to calculate general fling animation when the finger is released.

        if (startGradient != mCachedStartGradient

                || velocityFactor != mCachedVelocityFactor) {

            float speedup = mSpeedUpFactor * (1.0f - velocityFactor);

            mInterpolator = new PathInterpolator(speedup,

                    speedup * startGradient,

                    mLinearOutSlowInX2, mY2);

            float x1 = speedup;

            float y1 = speedup * startGradient;

            float x2 = mLinearOutSlowInX2;

            float y2 = mY2;

            try {

                mInterpolator = new PathInterpolator(x1, y1, x2, y2);

            } catch (IllegalArgumentException e) {

                throw new IllegalArgumentException("Illegal path with "

                        + "x1=" + x1 + " y1=" + y1 + " x2=" + x2 + " y2=" + y2, e);

            }

            mCachedStartGradient = startGradient;

            mCachedVelocityFactor = velocityFactor;

        }