Merge "Add support for ICU data pinning in the Zygote"

import android.content.res.Resources;

import android.content.res.TypedArray;

import android.icu.impl.CacheValue;

import android.icu.text.DecimalFormatSymbols;

import android.icu.util.ULocale;

import android.net.LocalServerSocket;

import android.opengl.EGL14;

import android.os.Process;

    static void preload() {

        Log.d(TAG, "begin preload");

        Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "BeginIcuCachePinning");

        beginIcuCachePinning();

        Trace.traceEnd(Trace.TRACE_TAG_DALVIK);

        Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PreloadClasses");

        preloadClasses();

        Trace.traceEnd(Trace.TRACE_TAG_DALVIK);

        // Ask the WebViewFactory to do any initialization that must run in the zygote process,

        // for memory sharing purposes.

        WebViewFactory.prepareWebViewInZygote();

        endIcuCachePinning();

        warmUpJcaProviders();

        Log.d(TAG, "end preload");

    }

    private static void beginIcuCachePinning() {

        // Pin ICU data in memory from this point that would normally be held by soft references.

        // Without this, any references created immediately below or during class preloading

        // would be collected when the Zygote GC runs in gcAndFinalize().

        Log.i(TAG, "Installing ICU cache reference pinning...");

        CacheValue.setStrength(CacheValue.Strength.STRONG);

        Log.i(TAG, "Preloading ICU data...");

        // Explicitly exercise code to cache data apps are likely to need.

        ULocale[] localesToPin = { ULocale.ROOT, ULocale.US, ULocale.getDefault() };

        for (ULocale uLocale : localesToPin) {

            new DecimalFormatSymbols(uLocale);

        }

    }

    private static void endIcuCachePinning() {

        // All cache references created by ICU from this point will be soft.

        CacheValue.setStrength(CacheValue.Strength.SOFT);

        Log.i(TAG, "Uninstalled ICU cache reference pinning...");

    }

    private static void preloadSharedLibraries() {

        Log.i(TAG, "Preloading shared libraries...");

        System.loadLibrary("android");