jni_generator: Pass object parameters as JavaParamRef.

chrome/browser/ui/android/tab_model/tab_model_jni_bridge.cc

 // 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.
 
 #include "chrome/browser/ui/android/tab_model/tab_model_jni_bridge.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/jni_weak_ref.h"
 #include "base/metrics/histogram.h"
@@ skipping 140 matching lines @@
 void TabModelJniBridge::BroadcastSessionRestoreComplete(JNIEnv* env,
                                                         jobject obj) {
   TabModel::BroadcastSessionRestoreComplete();
 }
 
 inline static base::TimeDelta GetTimeDelta(jlong ms) {
   return base::TimeDelta::FromMilliseconds(static_cast<int64>(ms));
 }
 
 void LogFromCloseMetric(JNIEnv* env,
-                        jclass jcaller,
+                        const JavaParamRef<jclass>& jcaller,
                         jlong ms,
                         jboolean perceived) {
   if (perceived) {
     UMA_HISTOGRAM_TIMES("Tabs.SwitchFromCloseLatency_Perceived",
                         GetTimeDelta(ms));
   } else {
     UMA_HISTOGRAM_TIMES("Tabs.SwitchFromCloseLatency_Actual",
                         GetTimeDelta(ms));
   }
 }
 
 void LogFromExitMetric(JNIEnv* env,
-                       jclass jcaller,
+                       const JavaParamRef<jclass>& jcaller,
                        jlong ms,
                        jboolean perceived) {
   if (perceived) {
     UMA_HISTOGRAM_TIMES("Tabs.SwitchFromExitLatency_Perceived",
                         GetTimeDelta(ms));
   } else {
     UMA_HISTOGRAM_TIMES("Tabs.SwitchFromExitLatency_Actual",
                         GetTimeDelta(ms));
   }
 }
 
 void LogFromNewMetric(JNIEnv* env,
-                      jclass jcaller,
+                      const JavaParamRef<jclass>& jcaller,
                       jlong ms,
                       jboolean perceived) {
   if (perceived) {
     UMA_HISTOGRAM_TIMES("Tabs.SwitchFromNewLatency_Perceived",
                         GetTimeDelta(ms));
   } else {
     UMA_HISTOGRAM_TIMES("Tabs.SwitchFromNewLatency_Actual",
                         GetTimeDelta(ms));
   }
 }
 
 void LogFromUserMetric(JNIEnv* env,
-                       jclass jcaller,
+                       const JavaParamRef<jclass>& jcaller,
                        jlong ms,
                        jboolean perceived) {
   if (perceived) {
     UMA_HISTOGRAM_TIMES("Tabs.SwitchFromUserLatency_Perceived",
                         GetTimeDelta(ms));
   } else {
     UMA_HISTOGRAM_TIMES("Tabs.SwitchFromUserLatency_Actual",
                         GetTimeDelta(ms));
   }
 }
 
 TabModelJniBridge::~TabModelJniBridge() {
   TabModelList::RemoveTabModel(this);
 }
 
 bool TabModelJniBridge::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
-static jlong Init(JNIEnv* env, jobject obj, jboolean is_incognito) {
+static jlong Init(JNIEnv* env,
+                  const JavaParamRef<jobject>& obj,
+                  jboolean is_incognito) {
   TabModel* tab_model = new TabModelJniBridge(env, obj, is_incognito);
   return reinterpret_cast<intptr_t>(tab_model);
 }