Selectively perform JNI registration in render processes on Android.

content/shell/android/shell_library_loader.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 "base/android/jni_android.h"
 #include "base/bind.h"
 #include "content/public/app/content_jni_onload.h"
 #include "content/public/app/content_main.h"
 #include "content/public/browser/android/compositor.h"
 #include "content/shell/android/shell_jni_registrar.h"
 #include "content/shell/app/shell_main_delegate.h"
 
 namespace {
 
 bool RegisterJNI(JNIEnv* env) {
   return content::android::RegisterShellJni(env);
 }
 
 bool Init() {
   content::Compositor::Initialize();
   content::SetContentMainDelegate(new content::ShellMainDelegate());
   return true;
 }
 
 }  // namespace
 
 
 // This is called by the VM when the shared library is first loaded.
 JNI_EXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
+  base::android::InitVM(vm);
+  base::android::InitJniRegistrationType(base::android::AttachCurrentThread(),
+                                         true);

[Torne, 2017/01/12 13:48:06]

Seems like we shouldn't have to force it for the shell?

   std::vector<base::android::RegisterCallback> register_callbacks;
   register_callbacks.push_back(base::Bind(&RegisterJNI));
   std::vector<base::android::InitCallback> init_callbacks;
   init_callbacks.push_back(base::Bind(&Init));
   if (!content::android::OnJNIOnLoadRegisterJNI(vm, register_callbacks) ||
       !content::android::OnJNIOnLoadInit(init_callbacks)) {
     return -1;
   }
   return JNI_VERSION_1_4;
 }