Implement chrome.experimental.downloads.getFileIcon().

BUG=12133
TEST=browser_tests --gtest_filter=DownloadExtensionTest.*:DownloadsApiTest.*

Review URL: http://codereview.chromium.org/8519004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@116898 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 33 insertions, 0 deletions

diff --git a/chrome/browser/download/download_file_icon_extractor.h b/chrome/browser/download/download_file_icon_extractor.h
new file mode 100644
index 0000000..6543ae9
--- /dev/null
+++ b/chrome/browser/download/download_file_icon_extractor.h
@@ -0,0 +1,33 @@
+// Copyright (c) 2012 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_DOWNLOAD_DOWNLOAD_FILE_ICON_EXTRACTOR_H_
+#define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_ICON_EXTRACTOR_H_
+#pragma once
+
+#include <string>
+
+#include "base/callback.h"
+#include "base/file_path.h"
+#include "chrome/browser/icon_loader.h"
+
+// Helper class for DownloadsGetFileIconFunction. Only used for a single icon
+// extraction.
+class DownloadFileIconExtractor {
+ public:
+  // Callback for |ExtractIconForPath|. The parameter is a URL as a string for a
+  // suitable icon. The string could be empty if the icon could not be
+  // determined.
+  typedef base::Callback<void(const std::string&)> IconURLCallback;
+
+  virtual ~DownloadFileIconExtractor() {}
+
+  // Should return false if the request was invalid.  If the return value is
+  // true, then |callback| should be called with the result.
+  virtual bool ExtractIconURLForPath(const FilePath& path,
+                                     IconLoader::IconSize icon_size,
+                                     IconURLCallback callback) = 0;
+};
+
+#endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_ICON_EXTRACTOR_H_