jni_generator: Pass object parameters as JavaParamRef.

chrome/browser/android/tab/thumbnail_tab_helper_android.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/tab/thumbnail_tab_helper_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/history/top_sites_factory.h"
@@ skipping 10 matching lines @@
 #include "ui/gfx/color_utils.h"
 #include "ui/gfx/image/image_skia.h"
 #include "url/gurl.h"
 
 // static
 bool RegisterThumbnailTabHelperAndroid(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 static void InitThumbnailHelper(JNIEnv* env,
-                                jclass clazz,
-                                jobject jweb_contents) {
+                                const JavaParamRef<jclass>& clazz,
+                                const JavaParamRef<jobject>& jweb_contents) {
   content::WebContents* web_contents =
       content::WebContents::FromJavaWebContents(jweb_contents);
   DCHECK(web_contents);
 
   // Don't allow ThumbnailTabHelper to take thumbnail snapshots.
   // Currently the process is driven from Tab, but long term will
   // move into a Android specific tab helper.
   // Bug: crbug.com/157431
   ThumbnailTabHelper* thumbnail_tab_helper =
       ThumbnailTabHelper::FromWebContents(web_contents);
   if (thumbnail_tab_helper)
     thumbnail_tab_helper->set_enabled(false);
 }
 
-static jboolean ShouldUpdateThumbnail(
-    JNIEnv* env, jclass clazz, jobject jprofile, jstring jurl) {
+static jboolean ShouldUpdateThumbnail(JNIEnv* env,
+                                      const JavaParamRef<jclass>& clazz,
+                                      const JavaParamRef<jobject>& jprofile,
+                                      const JavaParamRef<jstring>& jurl) {
   Profile* profile = ProfileAndroid::FromProfileAndroid(jprofile);
 
   GURL url(base::android::ConvertJavaStringToUTF8(env, jurl));
   scoped_refptr<thumbnails::ThumbnailService> thumbnail_service =
       ThumbnailServiceFactory::GetForProfile(profile);
   return (thumbnail_service.get() != NULL &&
           thumbnail_service->ShouldAcquirePageThumbnail(url));
 }
 
 static void UpdateThumbnail(JNIEnv* env,
-                            jclass clazz,
-                            jobject jweb_contents,
-                            jobject bitmap,
+                            const JavaParamRef<jclass>& clazz,
+                            const JavaParamRef<jobject>& jweb_contents,
+                            const JavaParamRef<jobject>& bitmap,
                             jboolean jat_top) {
   content::WebContents* web_contents =
       content::WebContents::FromJavaWebContents(jweb_contents);
   DCHECK(web_contents);
 
   Profile* profile = Profile::FromBrowserContext(
       web_contents->GetBrowserContext());
 
   gfx::JavaBitmap bitmap_lock(bitmap);
   SkBitmap sk_bitmap;
@@ skipping 17 matching lines @@
   ThumbnailScore score;
   score.at_top = jat_top;
   score.boring_score = color_utils::CalculateBoringScore(sk_bitmap);
   score.good_clipping = true;
   score.load_completed = !web_contents->IsLoading();
 
   gfx::Image image = gfx::Image::CreateFrom1xBitmap(sk_bitmap);
   const GURL& url = web_contents->GetURL();
   ts->SetPageThumbnail(url, image, score);
 }