weblayer: fetch more implementation package info.

Fetch shared library file data from the implementation package to
construct the correct asset path when using a Trichrome APK.

Change-Id: Id7bd259e5be182d6b13828235636d41b812ffdbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829867
Auto-Submit: Richard Coles <torne@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706141}

weblayer/public/java/org/chromium/weblayer/WebLayer.java

@@ -79,8 +79,9 @@ public final class WebLayer {
             // TODO: Make asset loading work on L, where WebViewDelegate doesn't exist.
             // WebViewDelegate.addWebViewAssetPath() accesses the currently loaded package info from
             // WebViewFactory, so we have to fake it.
-            implPackageInfo = appContext.getPackageManager().getPackageInfo(
-                    getImplPackageName(appContext), PackageManager.GET_META_DATA);
+            implPackageInfo =
+                    appContext.getPackageManager().getPackageInfo(getImplPackageName(appContext),
+                            PackageManager.GET_SHARED_LIBRARY_FILES | PackageManager.GET_META_DATA);
             Field packageInfo = WebViewFactory.class.getDeclaredField("sPackageInfo");
             packageInfo.setAccessible(true);
             packageInfo.set(null, implPackageInfo);