[Android] Prompt with infobar on filename conflict

chrome/browser/android/download_overwrite_infobar_delegate.h

Index: chrome/browser/android/download_overwrite_infobar_delegate.h
diff --git a/chrome/browser/android/download_overwrite_infobar_delegate.h b/chrome/browser/android/download_overwrite_infobar_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..d9a9896a6a76c5adcd610eb092df2bb5d16e7b8c
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+++ b/chrome/browser/android/download_overwrite_infobar_delegate.h
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+// Copyright 2014 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_OVERWRITE_INFOBAR_DELEGATE_H_
+#define CHROME_BROWSER_ANDROID_DOWNLOAD_OVERWRITE_INFOBAR_DELEGATE_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"
+
+namespace content {
+class DownloadItem;
+}
+
+namespace chrome {
+namespace android {
+
+// A class to implement 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. Do not download.
+//
+// Also, you can close the infobar.
+class DownloadOverwriteInfoBarDelegate : public infobars::InfoBarDelegate {
+ public:
+  ~DownloadOverwriteInfoBarDelegate() override;
+
+  static infobars::InfoBar* Create(
+      content::DownloadItem* download,
+      const base::FilePath& suggested_download_path,
+      const DownloadTargetDeterminerDelegate::FileSelectedCallback&
+          file_selected_callback);
+
+  // This is called when the user accepts overwriting.
+  bool AcceptOverwrite();
+
+  // This is called when the user chooses to create a new file.
+  bool CreateNewFile();
+
+  std::string GetFileName() const;
+  std::string GetDirName() const;
+  std::string GetDirFullPath() const;
+
+  // Implements InfoBarDelegate
+  void InfoBarDismissed() override;
+
+ private:
+  DownloadOverwriteInfoBarDelegate(
+      content::DownloadItem* download,
+      const base::FilePath& suggested_path,
+      const DownloadTargetDeterminerDelegate::FileSelectedCallback& callback);
+
+  // The suggested download path from download target determiner. This is used
+  // to show users the file name and the directory that will be used.
+  base::FilePath suggested_download_path_;
+
+  // A callback to download target determiner to notify that file selection
+  // is made (or cancelled).
+  DownloadTargetDeterminerDelegate::FileSelectedCallback
+      file_selected_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(DownloadOverwriteInfoBarDelegate);
+};
+
+}  // namespace android
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_ANDROID_DOWNLOAD_OVERWRITE_INFOBAR_DELEGATE_H_