implementation for new duplicate download UI

chrome/browser/android/download/android_download_manager_duplicate_infobar_delegate.h

+// Copyright 2016 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.
+
+#ifndef CHROME_BROWSER_ANDROID_DOWNLOAD_ANDROID_DOWNLOAD_MANAGER_DUPLICATE_INFOBAR_DELEGATE_H_
+#define CHROME_BROWSER_ANDROID_DOWNLOAD_ANDROID_DOWNLOAD_MANAGER_DUPLICATE_INFOBAR_DELEGATE_H_
+
+#include "base/android/scoped_java_ref.h"
+#include "base/macros.h"
+#include "chrome/browser/android/download/duplicate_download_infobar_delegate.h"
+#include "components/infobars/core/infobar_delegate.h"
+
+class InfoBarService;
+
+namespace chrome {
+namespace android {
+

[gone, 2016/11/07 19:45:55]

Add a comment describing what the infobar is actually used for.

[qinmin, 2016/11/08 00:30:50]

Done.

+// An infobar delegate that is initiated from Java side.
+class AndroidDownloadManagerDuplicateInfoBarDelegate
+    : public DuplicateDownloadInfoBarDelegate {
+ public:
+  ~AndroidDownloadManagerDuplicateInfoBarDelegate() override;
+
+  static void Create(InfoBarService* infobar_service,
+                     const std::string& file_path,
+                     jobject chrome_download_delegate,
+                     jobject download_info);
+
+ private:
+  AndroidDownloadManagerDuplicateInfoBarDelegate(
+      const std::string& file_path,
+      jobject chrome_download_delegate,
+      jobject download_info);
+
+  // DownloadOverwriteInfoBarDelegate:
+  infobars::InfoBarDelegate::InfoBarIdentifier GetIdentifier() const override;
+  bool Download() override;
+  bool Cancel() override;
+  std::string GetFilePath() const override;
+
+  std::string file_path_;
+  base::android::ScopedJavaGlobalRef<jobject> chrome_download_delegate_;
+  base::android::ScopedJavaGlobalRef<jobject> download_info_;
+
+  DISALLOW_COPY_AND_ASSIGN(AndroidDownloadManagerDuplicateInfoBarDelegate);
+};
+
+}  // namespace android
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_ANDROID_DOWNLOAD_ANDROID_DOWNLOAD_MANAGER_DUPLICATE_INFOBAR_DELEGATE_H_