Merge "Add Developer Option setting for Animator scaling."

import android.os.Handler;

import android.os.Looper;

import android.os.Message;

import android.os.SystemProperties;

import android.util.AndroidRuntimeException;

import android.view.Choreographer;

import android.view.animation.AccelerateDecelerateInterpolator;

    /**

     * Internal constants

     */

    private static float sDurationScale = 1.0f;

    private static boolean sDurationScaleInitialized = false;

    /**

     * Messages sent to timing handler: START is sent when an animation first begins.

    // How long the animation should last in ms

    private long mDuration = 300;

    private long mUnscaledDuration = 300;

    // The amount of time in ms to delay starting the animation after start() is called

    private long mStartDelay = 0;

    private long mUnscaledStartDelay = 0;

    // The number of times the animation will repeat. The default is 0, which means the animation

    // will play only once

     * useful.

     */

    public ValueAnimator() {

        if (!sDurationScaleInitialized) {

            // Scale value initialized per-process when first animator is constructed

            String scaleString = SystemProperties.get("persist.sys.ui.animation");

            if (!scaleString.isEmpty()) {

                sDurationScale = Float.parseFloat(scaleString);

            }

            sDurationScaleInitialized = true;

        }

        mDuration *= sDurationScale;

    }

    /**

            throw new IllegalArgumentException("Animators cannot have negative duration: " +

                    duration);

        }

        mDuration = duration;

        mUnscaledDuration = duration;

        mDuration = (long)(duration * sDurationScale);

        return this;

    }

     * @return The length of the animation, in milliseconds.

     */

    public long getDuration() {

        return mDuration;

        return mUnscaledDuration;

    }

    /**

     * @return the number of milliseconds to delay running the animation

     */

    public long getStartDelay() {

        return mStartDelay;

        return mUnscaledStartDelay;

    }

    /**

     * @param startDelay The amount of the delay, in milliseconds

     */

    public void setStartDelay(long startDelay) {

        this.mStartDelay = startDelay;

        this.mStartDelay = (long)(startDelay * sDurationScale);

        mUnscaledStartDelay = startDelay;

    }

    /**