Add FilePath to the gdb pretty printers.

tools/gdb/gdb_chrome.py

 #!/usr/bin/python
 # 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.
 
 """GDB support for Chrome types.
 
 Add this to your gdb by amending your ~/.gdbinit as follows:
   python
   import sys
   sys.path.insert(0, "/path/to/tools/gdb/")
   import gdb_chrome
 
 This module relies on the WebKit gdb module already existing in
 your Python path.
 """
 
 import gdb
 import webkit
 
 class String16Printer(webkit.StringPrinter):
     def to_string(self):
         return webkit.ustring_to_string(self.val['_M_dataplus']['_M_p'])
 
 class GURLPrinter(webkit.StringPrinter):
     def to_string(self):
         return self.val['spec_']
 
+class FilePathPrinter(object):
+    def __init__(self, val):
+        self.val = val
+
+    def to_string(self):
+        return self.val['path_']['_M_dataplus']['_M_p']
+
+
 def lookup_function(val):
-    typ = str(val.type)
-    if typ == 'string16':
-        return String16Printer(val)
-    elif typ == 'GURL':
-        return GURLPrinter(val)
+    type_to_printer = {
+        'string16': String16Printer,
+        'GURL': GURLPrinter,
+        'FilePath': FilePathPrinter,
+    }
+
+    printer = type_to_printer.get(str(val.type), None)
+    if printer:
+        return printer(val)
     return None
 
 gdb.pretty_printers.append(lookup_function)