implementation for new duplicate download UI

chrome/browser/ui/android/infobars/duplicate_download_infobar.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_UI_ANDROID_INFOBARS_DUPLICATE_DOWNLOAD_INFOBAR_H_
+#define CHROME_BROWSER_UI_ANDROID_INFOBARS_DUPLICATE_DOWNLOAD_INFOBAR_H_
+
+#include "base/android/scoped_java_ref.h"
+#include "base/macros.h"
+#include "chrome/browser/ui/android/infobars/infobar_android.h"
+
+namespace chrome {
+namespace android {
+class DuplicateDownloadInfoBarDelegate;
+}
+}
+
+// A native-side implementation of an infobar to ask whether to continue
+// downloading if target file already exists.
+class DuplicateDownloadInfoBar : public InfoBarAndroid {

[gone, 2016/11/07 19:45:56]

This should extend ConfimrInfoBar instead.  It's prompting the user for
something.

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

Done.

+ public:
+  static std::unique_ptr<infobars::InfoBar> CreateInfoBar(
+      std::unique_ptr<chrome::android::DuplicateDownloadInfoBarDelegate>
+          delegate);
+  ~DuplicateDownloadInfoBar() override;
+
+ private:
+  explicit DuplicateDownloadInfoBar(
+      std::unique_ptr<chrome::android::DuplicateDownloadInfoBarDelegate>
+          delegate);
+
+  // InfoBarAndroid:
+  base::android::ScopedJavaLocalRef<jobject> CreateRenderInfoBar(
+      JNIEnv* env) override;
+  void ProcessButton(int action) override;
+
+  chrome::android::DuplicateDownloadInfoBarDelegate* GetDelegate();
+
+  DISALLOW_COPY_AND_ASSIGN(DuplicateDownloadInfoBar);
+};
+
+#endif  // CHROME_BROWSER_UI_ANDROID_INFOBARS_DUPLICATE_DOWNLOAD_INFOBAR_H_