Merge "Always re-enable the fallback WebView if needed." into qt-dev

    void prepareWebViewInSystemServer() {

        migrateFallbackStateOnBoot();

        mWebViewUpdater.prepareWebViewInSystemServer();

        if (getCurrentWebViewPackage() == null) {

            // We didn't find a valid WebView implementation. Try explicitly re-enabling the

            // fallback package for all users in case it was disabled, even if we already did the

            // one-time migration before. If this actually changes the state, WebViewUpdater will

            // see the PackageManager broadcast shortly and try again.

            WebViewProviderInfo[] webviewProviders = mSystemInterface.getWebViewPackages();

            WebViewProviderInfo fallbackProvider = getFallbackProvider(webviewProviders);

            if (fallbackProvider != null) {

                Slog.w(TAG, "No valid provider, trying to enable " + fallbackProvider.packageName);

                mSystemInterface.enablePackageForAllUsers(mContext, fallbackProvider.packageName,

                                                          true);

            } else {

                Slog.e(TAG, "No valid provider and no fallback available.");

            }

        }

        boolean multiProcessEnabled = isMultiProcessEnabled();

        mSystemInterface.notifyZygote(multiProcessEnabled);

        if (multiProcessEnabled) {