jni_generator: Pass object parameters as JavaParamRef.

chrome/browser/android/compositor/scene_layer/contextual_search_scene_layer.cc

 // Copyright 2015 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 "chrome/browser/android/compositor/scene_layer/contextual_search_scene_layer.h"
 
 #include "base/android/jni_android.h"
 #include "chrome/browser/android/compositor/layer/contextual_search_layer.h"
 #include "content/public/browser/android/content_view_core.h"
 #include "jni/ContextualSearchSceneLayer_jni.h"
@@ skipping 97 matching lines @@
       arrow_icon_rotation,
       close_icon_visible,
       close_icon_opacity,
       progress_bar_visible,
       progress_bar_y,
       progress_bar_height,
       progress_bar_opacity,
       progress_bar_completion);
 }
 
-static jlong Init(JNIEnv* env, jobject jobj) {
+static jlong Init(JNIEnv* env, const JavaParamRef<jobject>& jobj) {
   // This will automatically bind to the Java object and pass ownership there.
   ContextualSearchSceneLayer* tree_provider =
       new ContextualSearchSceneLayer(env, jobj);
   return reinterpret_cast<intptr_t>(tree_provider);
 }
 
 bool RegisterContextualSearchSceneLayer(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace chrome