Add a Create method to DesktopNotificationHandler and stubs for the notification objects.

build/common.gypi

 # 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 419 matching lines @@
 
     # If debug_devtools is set to 1, JavaScript files for DevTools are
     # stored as is and loaded from disk. Otherwise, a concatenated file
     # is stored in resources.pak. It is still possible to load JS files
     # from disk by passing --debug-devtools cmdline switch.
     'debug_devtools%': 0,
 
     # Point to ICU directory.
     'icu_src_dir': '../third_party/icu',
 
+    # Enable desktop notifications.
+    'enable_desktop_notifications%': 1,
+
     'conditions': [
       ['os_posix==1 and OS!="mac"', {
         # This will set gcc_version to XY if you are running gcc X.Y.*.
         # This is used to tweak build flags for gcc 4.4.
         'gcc_version%': '<!(python <(DEPTH)/build/compiler_version.py)',
         # Figure out the python architecture to decide if we build pyauto.
         'python_arch%': '<!(<(DEPTH)/build/linux/python_arch.sh <(sysroot)/usr/lib/libpython<(python_ver).so.1.0)',
         'conditions': [
           ['branding=="Chrome"', {
             'linux_breakpad%': 1,
@@ skipping 1305 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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