Allow JNI registration to be performed eagerly.

android_webview/lib/main/webview_entry_point.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "android_webview/lib/main/aw_main_delegate.h"
 #include "android_webview/native/android_webview_jni_registrar.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_registrar.h"
 #include "components/navigation_interception/component_jni_registrar.h"
 #include "components/web_contents_delegate_android/component_jni_registrar.h"
 #include "content/public/app/android_library_loader_hooks.h"
 #include "content/public/app/content_main.h"
 
 static base::android::RegistrationMethod
     kWebViewDependencyRegisteredMethods[] = {
     { "NavigationInterception",
         navigation_interception::RegisterNavigationInterceptionJni },
     { "WebContentsDelegateAndroid",
         web_contents_delegate_android::RegisterWebContentsDelegateAndroidJni },
 };
 
 // This is called by the VM when the shared library is first loaded.
 // Most of the initialization is done in LibraryLoadedOnMainThread(), not here.
 JNI_EXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
   base::android::InitVM(vm);
   JNIEnv* env = base::android::AttachCurrentThread();
   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,
       kWebViewDependencyRegisteredMethods,
       arraysize(kWebViewDependencyRegisteredMethods)))
     return -1;
 
   if (!android_webview::RegisterJni(env))
     return -1;
 
   content::SetContentMainDelegate(new android_webview::AwMainDelegate());
 
   return JNI_VERSION_1_4;
 }