Split JNI init so native library preloading dosn't cause native init.

base/android/library_loader/library_loader_hooks.h

 // Copyright 2014 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.
 
 #ifndef BASE_ANDROID_LIBRARY_LOADER_LIBRARY_LOADER_HOOKS_H_
 #define BASE_ANDROID_LIBRARY_LOADER_LIBRARY_LOADER_HOOKS_H_
 
 #include <jni.h>
 
 #include "base/base_export.h"
+#include "base/callback.h"
 
 namespace base {
 namespace android {
 
 // The process the shared library is loaded in.
 // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.base.library_loader
 enum LibraryProcessType {
   // The LibraryLoad has not been initialized.
   PROCESS_UNINITIALIZED = 0,
   // Shared library is running in browser process.
   PROCESS_BROWSER = 1,
   // Shared library is running in child process.
   PROCESS_CHILD = 2,
   // Shared library is running in the app that uses webview.
   PROCESS_WEBVIEW = 3,
   // Shared library is running in child process as part of webview.
   PROCESS_WEBVIEW_CHILD = 4,
 };
 
+typedef bool NativeInitializationHook();
+
+BASE_EXPORT void SetNativeInitializationHook(
+    NativeInitializationHook native_initialization_hook);
+
 // Record any pending renderer histogram value as histograms.  Pending values
 // are set by RegisterChromiumAndroidLinkerRendererHistogram and
 // RegisterLibraryPreloaderRendererHistogram.
 BASE_EXPORT void RecordLibraryLoaderRendererHistograms();
 
 // Registers the callbacks that allows the entry point of the library to be
 // exposed to the calling java code.  This handles only registering the
 // the callbacks needed by the loader. Any application specific JNI bindings
 // should happen once the native library has fully loaded, either in the library
 // loaded hook function or later.
@@ skipping 28 matching lines @@
 BASE_EXPORT LibraryProcessType GetLibraryProcessType(JNIEnv* env);
 
 // Initialize AtExitManager, this must be done at the begining of loading
 // shared library.
 void InitAtExitManager();
 
 }  // namespace android
 }  // namespace base
 
 #endif  // BASE_ANDROID_LIBRARY_LOADER_LIBRARY_LOADER_HOOKS_H_