Updating WebView on AOSP Android 6.0

Question

I am working on a device based on AOSP Android 6.0 (Marshmallow).
I wanted to update standard Android webview to the latest version for using the latest JavaScript.
For this I replaced external/chromium-webview/prebuilt/arm64/webview.apk with the latest version.
Also in the frameworks/base/core/res/res/values/config.xml I changed the value of config_webViewPackageName from com.android.webview to com.google.android.webview. But when I tried to launch some application that using webview (for example standard android browser) I got such error:

10-10 12:08:08.923 17802 17802 I WebViewFactory: Loading com.google.android.webview version 61.0.3163.98 (code 316309850)
10-10 12:08:52.107 20530 20530 E WebViewFactory: error loading provider
10-10 12:08:52.107 20530 20530 E WebViewFactory: java.lang.ClassNotFoundException: com.android.webview.chromium.WebViewChromiumFactoryProvider
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at java.lang.Class.classForName(Native Method)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at java.lang.Class.forName(Class.java:324)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at android.webkit.WebViewFactory.getChromiumProviderClass(WebViewFactory.java:229)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at android.webkit.WebViewFactory.getProviderClass(WebViewFactory.java:193)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at android.webkit.WebViewFactory.getProvider(WebViewFactory.java:158)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at android.webkit.CookieManager.getInstance(CookieManager.java:39)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at com.android.browser.BrowserSettings.syncSharedSettings(BrowserSettings.java:312)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at com.android.browser.BrowserSettings.setController(BrowserSettings.java:148)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at com.android.browser.Controller.<init>(Controller.java:235)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at com.android.browser.BrowserActivity.createController(BrowserActivity.java:84)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at com.android.browser.BrowserActivity.onCreate(BrowserActivity.java:73)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at android.app.Activity.performCreate(Activity.java:6251)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at android.app.ActivityThread.-wrap11(ActivityThread.java)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at android.os.Handler.dispatchMessage(Handler.java:102)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at android.os.Looper.loop(Looper.java:148)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at android.app.ActivityThread.main(ActivityThread.java:5417)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at java.lang.reflect.Method.invoke(Native Method)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:742)
10-10 12:08:52.107 20530 20530 E WebViewFactory:    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:632)

Did somebody faced such issue?

Answer 1

Finally we have found that the problem was because webmusic.apk was not signed with the system signature. That's why it was not properly installed.
Steps from the question How to sign Android app with system signature? solved the issue.