ShellUtil: Add generic methods to add/delete Windows file associations.

chrome/browser/file_associations_win.h

Index: chrome/browser/file_associations_win.h
diff --git a/chrome/browser/file_associations_win.h b/chrome/browser/file_associations_win.h
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index 0000000000000000000000000000000000000000..4a362edce7da09a917f1a0d96e96a623ed801d6a
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+++ b/chrome/browser/file_associations_win.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_FILE_ASSOCIATIONS_WIN_H_
+#define CHROME_BROWSER_FILE_ASSOCIATIONS_WIN_H_
+
+#include <set>
+#include <string>
+
+// This module is for manipulating per-user Windows file associations from an
+// unprivileged process (ie, Chrome itself). For the code that establishes the
+// machine-level associations during the Chrome installer, see
+// chrome/installer/util/shell_util.h.
+
+namespace base {
+class CommandLine;
+class FilePath;
+}
+
+// Associates a set of file extensions with a particular application in the
+// Windows registry, for the current user only. If an extension has no existing
+// default association, the given application becomes the default. Otherwise,
+// the application is added to the Open With menu for this type, but does not
+// become the default.
+//
+// |progid| is the unique internal name Windows will use for file associations

[jackhou1, 2014/08/19 08:16:54]

Is there a convention for how to specify a progid? If so, it's probably worth
mentioning it here.

[Matt Giuca, 2014/08/19 08:24:48]

Not really. Microsoft recommends "Vendor.Application" but nobody seems to follow
it, including themselves. I intend to just use "chrome-APPID" for Chrome apps,
and it doesn't make sense to document that here because this is more general
than Chrome apps.

So I think saying it's a "unique name" is sufficient.

+// with this application.
+// |command_line| is the command to execute when opening a file via this
+// association. It should contain "%1" to pass the filename as an argument.
+// |file_type_name| and |icon_path| are the friendly name, and the path of the
+// icon, respectively, that will be used for files of these types when
+// associated with this application by default. (They are NOT the name/icon that
+// will represent the application under the Open With menu.)
+// Returns true on success; otherwise logs to stderr and returns false.
+bool AddWindowsFileAssociations(const std::string& progid,
+                                const base::CommandLine& command_line,
+                                const std::string& file_type_name,
+                                const base::FilePath& icon_path,
+                                const std::set<std::string>& file_extensions);
+
+// Deletes all associations with a particular application in the Windows
+// registry, for the current user only.
+// |progid| is the unique internal name Windows uses for file associations with
+// this application, as given to AddWindowsFileAssociations. All information
+// associated with this name will be deleted.
+bool DeleteWindowsFileAssociations(const std::string& progid);
+
+#endif  // CHROME_BROWSER_FILE_ASSOCIATIONS_WIN_H_