Allow JNI registration to be performed eagerly.

android_webview/lib/main/webview_entry_point.cc

Index: android_webview/lib/main/webview_entry_point.cc
diff --git a/android_webview/lib/main/webview_entry_point.cc b/android_webview/lib/main/webview_entry_point.cc
index e7ea8af938d7c8a5faaad2c1c837f6c7f5a3e9e6..858601f3ba0335fe7f32870ddb5df7b947a6b63a 100644
--- a/android_webview/lib/main/webview_entry_point.cc
+++ b/android_webview/lib/main/webview_entry_point.cc
@@ -27,6 +27,11 @@ JNI_EXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
   if (!content::RegisterLibraryLoaderEntryHook(env))
     return -1;
 
+  // Register content JNI functions now, rather than waiting until
+  // LibraryLoadedOnMainThread, so that we can call into native code early.
+  if (!content::EnsureJniRegistered(env))
+    return -1;
+
   // Register JNI for components we depend on.
   if (!RegisterNativeMethods(
       env,