Merge "Start the webview_zygote at boot, but in the background." into pi-dev

import android.app.LoadedApk;

import android.content.pm.ApplicationInfo;

import android.content.pm.PackageInfo;

import android.os.AsyncTask;

import android.os.Build;

import android.os.ChildZygoteProcess;

import android.os.Process;

        synchronized (sLock) {

            sMultiprocessEnabled = enabled;

            // When multi-process is disabled, kill the zygote. When it is enabled,

            // the zygote is not explicitly started here to avoid waiting on the

            // zygote launch at boot. Instead, the zygote will be started when it is

            // first needed in getProcess().

            if (!enabled) {

            // When toggling between multi-process being on/off, start or stop the

            // zygote. If it is enabled and the zygote is not yet started, launch it.

            // Otherwise, kill it. The name may be null if the package information has

            // not yet been resolved.

            if (enabled) {

                // Run on a background thread as this waits for the zygote to start and we don't

                // want to block the caller on this. It's okay if this is delayed as anyone trying

                // to use the zygote will call it first anyway.

                AsyncTask.THREAD_POOL_EXECUTOR.execute(WebViewZygote::getProcess);

            } else {

                // No need to run this in the background, it's very brief.

                stopZygoteLocked();

            }

        }