Pass JavaRef to Java methods in android_webview.

android_webview/native/aw_pdf_exporter.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_pdf_exporter.h"
 
 #include "android_webview/browser/aw_print_manager.h"
 #include "base/android/jni_android.h"
 #include "content/public/browser/browser_thread.h"
 #include "jni/AwPdfExporter_jni.h"
 #include "printing/print_settings.h"
 #include "printing/units.h"
 
 using base::android::JavaParamRef;
+using base::android::JavaRef;
 using base::android::ScopedJavaLocalRef;
 
 namespace android_webview {
 
 AwPdfExporter::AwPdfExporter(JNIEnv* env,
-                             jobject obj,
+                             const JavaRef<jobject>& obj,
                              content::WebContents* web_contents)
-    : java_ref_(env, obj),
-      web_contents_(web_contents) {
-  DCHECK(obj);
+    : java_ref_(env, obj), web_contents_(web_contents) {
+  DCHECK(!obj.is_null());
   Java_AwPdfExporter_setNativeAwPdfExporter(
       env, obj, reinterpret_cast<intptr_t>(this));
 }
 
 AwPdfExporter::~AwPdfExporter() {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
   if (obj.is_null())
     return;
   // Clear the Java peer's weak pointer to |this| object.
@@ skipping 17 matching lines @@
 }
 
 namespace {
 // Converts from 1/1000 of inches to device units using DPI.
 int MilsToDots(int val, int dpi) {
   return static_cast<int>(printing::ConvertUnitDouble(val, 1000.0, dpi));
 }
 }  // anonymous namespace
 
 void AwPdfExporter::InitPdfSettings(JNIEnv* env,
-                                    jobject obj,
+                                    const JavaRef<jobject>& obj,
                                     printing::PrintSettings& settings) {
   int dpi = Java_AwPdfExporter_getDpi(env, obj);
   int width = Java_AwPdfExporter_getPageWidth(env, obj);
   int height = Java_AwPdfExporter_getPageHeight(env, obj);
   gfx::Size physical_size_device_units;
   int width_in_dots = MilsToDots(width, dpi);
   int height_in_dots = MilsToDots(height, dpi);
   physical_size_device_units.SetSize(width_in_dots, height_in_dots);
 
   gfx::Rect printable_area_device_units;
@@ skipping 26 matching lines @@
   if (obj.is_null())
     return;
   Java_AwPdfExporter_didExportPdf(env, obj, success);
 }
 
 bool RegisterAwPdfExporter(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android_webview