[Android] Prompt with infobar on filename conflict

chrome/browser/android/download/download_overwrite_infobar_delegate.h

+// 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.
+
+#ifndef CHROME_BROWSER_ANDROID_DOWNLOAD_DOWNLOAD_OVERWRITE_INFOBAR_DELEGATE_H_
+#define CHROME_BROWSER_ANDROID_DOWNLOAD_DOWNLOAD_OVERWRITE_INFOBAR_DELEGATE_H_
+
+#include "base/android/scoped_java_ref.h"
+#include "base/callback.h"
+#include "base/files/file_path.h"
+#include "chrome/browser/download/download_target_determiner_delegate.h"
+#include "components/infobars/core/infobar_delegate.h"
+
+class InfoBarService;
+
+namespace chrome {
+namespace android {
+
+// An infobar that asks if it is ok to overwrite an
+// existing file. Due to limited disk space on Android, two options are
+// presented to the user when downloading a file whose name conflicts with an
+// already present file:
+//
+// 1. Overwrite the file.
+// 2. Create a new file.
+//
+// Also, the user can dismiss the infobar to abort the download.
+//
+// Note that this infobar does not expire if the user subsequently navigates,
+// since such navigations won't automatically cancel the underlying download.
+class DownloadOverwriteInfoBarDelegate : public infobars::InfoBarDelegate {
+ public:
+  // This is called when the user chooses to overwrite the existing file.
+  virtual void OverwriteExistingFile() = 0;
+
+  // This is called when the user chooses to create a new file.
+  virtual void CreateNewFile() = 0;
+
+  // Gets the file name to be downloaded.
+  virtual std::string GetFileName() const = 0;
+  // Gets the download directory name.
+  virtual std::string GetDirName() const = 0;
+  // Gets the full directory path.
+  virtual std::string GetDirFullPath() const = 0;
+
+  bool ShouldExpire(const NavigationDetails& details) const override;
+};
+
+}  // namespace android
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_ANDROID_DOWNLOAD_DOWNLOAD_OVERWRITE_INFOBAR_DELEGATE_H_