Modified the pepper file chooser API to support filtering files by extensions.

ppapi/cpp/dev/file_chooser_dev.h

 // Copyright (c) 2011 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 PPAPI_CPP_DEV_FILE_CHOOSER_DEV_H_
 #define PPAPI_CPP_DEV_FILE_CHOOSER_DEV_H_
 
 #include <vector>
 
 #include "ppapi/c/dev/ppb_file_chooser_dev.h"
@@ skipping 18 matching lines @@
   /// screen relative to the tab containing the instance.  Returns 0 if passed
   /// an invalid instance.
   ///
   /// @param mode A PPB_FileChooser_Dev instance can be used to select a single
   /// file (PP_FILECHOOSERMODE_OPEN) or multiple files
   /// (PP_FILECHOOSERMODE_OPENMULTIPLE). Unlike the HTML5 <input type="file">
   /// tag, a PPB_FileChooser_Dev instance cannot be used to select a directory.
   /// In order to get the list of files in a directory, the
   /// PPB_DirectoryReader_Dev interface must be used.
   ///
-  /// @param accept_mime_types A comma-separated list of MIME types such as
-  /// "audio/ *,text/plain" (note there should be no space between the '/' and
-  /// the '*', but one is added to avoid confusing C++ comments).  The dialog
-  /// may restrict selectable files to the specified MIME types. An empty string
-  /// or an undefined var may be given to indicate that all types should be
+  /// @param accept_types A comma-separated list of MIME types and file
+  /// extensions such as "audio/ *,text/plain,.html" (note there should be
+  /// no space between the '/' and the '*', but one is added to avoid confusing
+  /// C++ comments). The dialog may restrict selectable files to the specified
+  /// MIME types and file extensions. If a string in the comma-separated list
+  /// begins with a period (.) then the string is interpreted as a file
+  /// extension, otherwise it is interpreted as a MIME-type. An empty string or
+  /// an undefined var may be given to indicate that all types should be
   /// accepted.
-  ///
-  /// TODO(darin): What if the mime type is unknown to the system?  The plugin
-  /// may wish to describe the mime type and provide a matching file extension.
-  /// It is more webby to use mime types here instead of file extensions.
   FileChooser_Dev(const InstanceHandle& instance,
                   PP_FileChooserMode_Dev mode,
-                  const Var& accept_mime_types);
+                  const Var& accept_types);
 
   FileChooser_Dev(const FileChooser_Dev& other);
 
   /// This function displays a previously created file chooser resource as a
   /// dialog box, prompting the user to choose a file or files. This function
   /// must be called in response to a user gesture, such as a mouse click or
   /// touch event. The callback is called with PP_OK on successful completion
   /// with a file (or files) selected, PP_ERROR_USERCANCEL if the user selected
   /// no file, or another error code from pp_errors.h on failure.
   ///
@@ skipping 30 matching lines @@
   // the caller is expecting.
   //
   // This takes a heap-allocated ChooseCallbackData0_5 struct passed as the
   // user data and deletes it when the call completes.
   static void CallbackConverter(void* user_data, int32_t result);
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_FILE_CHOOSER_DEV_H_