Pass method parameters as JavaParamRef in android_webview.

android_webview/native/aw_picture.cc

 // Copyright 2013 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 "android_webview/native/aw_picture.h"
 
 #include "android_webview/native/java_browser_view_renderer_helper.h"
 #include "base/bind.h"
 #include "jni/AwPicture_jni.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
 namespace android_webview {
 
 AwPicture::AwPicture(skia::RefPtr<SkPicture> picture)
     : picture_(picture) {
   DCHECK(picture_);
 }
 
 AwPicture::~AwPicture() {}
 
-void AwPicture::Destroy(JNIEnv* env, jobject obj) {
+void AwPicture::Destroy(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   delete this;
 }
 
-jint AwPicture::GetWidth(JNIEnv* env, jobject obj) {
+jint AwPicture::GetWidth(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   return picture_->cullRect().roundOut().width();
 }
 
-jint AwPicture::GetHeight(JNIEnv* env, jobject obj) {
+jint AwPicture::GetHeight(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   return picture_->cullRect().roundOut().height();
 }
 
-void AwPicture::Draw(JNIEnv* env, jobject obj, jobject canvas) {
+void AwPicture::Draw(JNIEnv* env,
+                     const JavaParamRef<jobject>& obj,
+                     const JavaParamRef<jobject>& canvas) {
   const SkIRect bounds = picture_->cullRect().roundOut();
   scoped_ptr<SoftwareCanvasHolder> canvas_holder = SoftwareCanvasHolder::Create(
       canvas, gfx::Vector2d(), gfx::Size(bounds.width(), bounds.height()),
       false);
   if (!canvas_holder || !canvas_holder->GetCanvas()) {
     LOG(ERROR) << "Couldn't draw picture";
     return;
   }
   picture_->playback(canvas_holder->GetCanvas());
 }
 
 bool RegisterAwPicture(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android_webview