jni_generator: Pass object parameters as JavaParamRef.

chrome/browser/android/compositor/scene_layer/static_tab_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/static_tab_scene_layer.h"
 
 #include "cc/layers/layer.h"
 #include "chrome/browser/android/compositor/layer/content_layer.h"
 #include "chrome/browser/android/compositor/layer_title_cache.h"
 #include "chrome/browser/android/compositor/tab_content_manager.h"
@@ skipping 118 matching lines @@
   if (content_scene_layer && content_scene_layer->layer()) {
     content_scene_layer_ = content_scene_layer->layer();
     if (content_scene_layer_.get())
       layer_->AddChild(content_scene_layer_);
   } else if (content_scene_layer_) {
     content_scene_layer_->RemoveFromParent();
     content_scene_layer_ = nullptr;
   }
 }
 
-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.
   StaticTabSceneLayer* scene_layer = new StaticTabSceneLayer(env, jobj);
   return reinterpret_cast<intptr_t>(scene_layer);
 }
 
 bool RegisterStaticTabSceneLayer(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace chrome