Register a Service Worker when an extension is enabled.

tools/gdb/gdb_chrome.py

 # 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/")
@@ skipping 176 matching lines @@
 pp_set.add_printer('base::Time', '^base::Time$', TimePrinter)
 
 
 class IpcMessagePrinter(Printer):
     def header(self):
         return self.val['header_'].cast(
             gdb.lookup_type('IPC::Message::Header').pointer())
 
     def to_string(self):
         message_type = self.header()['type']
+        try:
+          type = self.val.dynamic_type
+        except:
+          type = self.val.type
         return '%s of kind %s line %s' % (
-            self.val.dynamic_type,
+            type,
             (message_type >> 16).cast(gdb.lookup_type('IPCMessageStart')),
             message_type & 0xffff)
 
     def children(self):
         yield ('header_', self.header().dereference())
         yield ('capacity_', self.val['capacity_'])
         yield ('variable_buffer_offset_', self.val['variable_buffer_offset_'])
         for field in self.val.type.fields():
             if field.is_base_class:
                 continue
@@ skipping 79 matching lines @@
         yield ('sudden_termination_allowed_',
                self.val['sudden_termination_allowed_'])
         yield ('ignore_input_events_', self.val['ignore_input_events_'])
         yield ('is_guest_', self.val['is_guest_'])
 pp_set.add_printer('content::RenderProcessHostImpl',
                    '^content::RenderProcessHostImpl$',
                    RenderProcessHostImplPrinter)
 
 
 gdb.printing.register_pretty_printer(gdb, pp_set, replace=_DEBUGGING)