This CL adds support for extension in GYP.

pylib/gyp/xcode_emulation.py

Index: pylib/gyp/xcode_emulation.py
diff --git a/pylib/gyp/xcode_emulation.py b/pylib/gyp/xcode_emulation.py
index 859cd5a93722e9c1efb9f4cb210be180e03e7b11..684e9bd0149158c71ad2ba2438a16697fd0eb719 100644
--- a/pylib/gyp/xcode_emulation.py
+++ b/pylib/gyp/xcode_emulation.py
@@ -238,6 +238,8 @@ class XcodeSettings(object):
       return '.' + self.spec.get('product_extension', wrapper_extension)
     elif self.spec['type'] == 'executable':
       return '.' + self.spec.get('product_extension', 'app')
+    elif self.spec['type'] == 'extension':
+      return '.' + self.spec.get('product_extension', 'appex')
     else:
       assert False, "Don't know extension for '%s', target '%s'" % (
           self.spec['type'], self.spec['target_name'])
@@ -284,7 +286,7 @@ class XcodeSettings(object):
     """Returns the qualified path to the bundle's plist file. E.g.
     Chromium.app/Contents/Info.plist. Only valid for bundles."""
     assert self._IsBundle()
-    if self.spec['type'] in ('executable', 'loadable_module'):
+    if self.spec['type'] in ('executable', 'extension', 'loadable_module'):
       return os.path.join(self.GetBundleContentsFolderPath(), 'Info.plist')
     else:
       return os.path.join(self.GetBundleContentsFolderPath(),
@@ -295,12 +297,14 @@ class XcodeSettings(object):
     if self._IsBundle():
       return {
         'executable': 'com.apple.product-type.application',
+        'extension': 'com.apple.product-type.app-extension',
         'loadable_module': 'com.apple.product-type.bundle',
         'shared_library': 'com.apple.product-type.framework',
       }[self.spec['type']]
     else:
       return {
         'executable': 'com.apple.product-type.tool',
+        'extension': 'com.apple.product-type.app-extension',
         'loadable_module': 'com.apple.product-type.library.dynamic',
         'shared_library': 'com.apple.product-type.library.dynamic',
         'static_library': 'com.apple.product-type.library.static',
@@ -309,10 +313,12 @@ class XcodeSettings(object):
   def GetMachOType(self):
     """Returns the MACH_O_TYPE of this target."""
     # Weird, but matches Xcode.
-    if not self._IsBundle() and self.spec['type'] == 'executable':
+    if not self._IsBundle() and (self.spec['type'] == 'executable' or
+        self.spec['type'] == 'extension'):
       return ''
     return {
       'executable': 'mh_execute',
+      'extension': 'mh_execute',
       'static_library': 'staticlib',
       'shared_library': 'mh_dylib',
       'loadable_module': 'mh_bundle',
@@ -324,7 +330,7 @@ class XcodeSettings(object):
     assert self._IsBundle()
     if self.spec['type'] in ('shared_library') or self.isIOS:
       path = self.GetBundleContentsFolderPath()
-    elif self.spec['type'] in ('executable', 'loadable_module'):
+    elif self.spec['type'] in ('executable', 'extension', 'loadable_module'):
       path = os.path.join(self.GetBundleContentsFolderPath(), 'MacOS')
     return os.path.join(path, self.GetExecutableName())
 
@@ -333,6 +339,7 @@ class XcodeSettings(object):
       return '.' + self.spec['product_extension']
     return {
       'executable': '',
+      'extension': '',
       'static_library': '.a',
       'shared_library': '.dylib',
       'loadable_module': '.so',
@@ -341,6 +348,7 @@ class XcodeSettings(object):
   def _GetStandaloneExecutablePrefix(self):
     return self.spec.get('product_prefix', {
       'executable': '',
+      'extension': '',
       'static_library': 'lib',
       'shared_library': 'lib',
       # Non-bundled loadable_modules are called foo.so for some reason
@@ -352,8 +360,8 @@ class XcodeSettings(object):
     """Returns the name of the non-bundle binary represented by this target.
     E.g. hello_world. Only valid for non-bundles."""
     assert not self._IsBundle()
-    assert self.spec['type'] in (
-        'executable', 'shared_library', 'static_library', 'loadable_module'), (
+    assert self.spec['type'] in ('executable', 'extension', 'shared_library',
+        'static_library', 'loadable_module'), (
         'Unexpected type %s' % self.spec['type'])
     target = self.spec['target_name']
     if self.spec['type'] == 'static_library':
@@ -794,6 +802,16 @@ class XcodeSettings(object):
     for directory in framework_dirs:
       ldflags.append('-F' + directory.replace('$(SDKROOT)', sdk_root))
 
+    if sdk_root and self.spec['type'] == "extension":
+      # Adds the link flags for extensions. These flags are common for all
+      # extensions and provide loader and main function.
+      # These flags reflect the compilation options used by xcode to compile
+      # extensions.
+      ldflags.append('-lpkstart ' + sdk_root +
+          '/System/Library/PrivateFrameworks/PlugInKit.framework/PlugInKit')
+      ldflags.append('-fapplication-extension ' +
+          '-Xlinker -rpath -Xlinker @executable_path/../../Frameworks')
+
     self._Appendf(ldflags, 'CLANG_CXX_LIBRARY', '-stdlib=%s')
 
     self.configname = None
@@ -870,6 +888,8 @@ class XcodeSettings(object):
         default_strip_style = 'non-global'
       elif self.spec['type'] == 'executable':
         default_strip_style = 'all'
+      elif self.spec['type'] == 'extension':
+        default_strip_style = 'all'
 
       strip_style = self._Settings().get('STRIP_STYLE', default_strip_style)
       strip_flags = {
@@ -921,7 +941,8 @@ class XcodeSettings(object):
     """Return a shell command to codesign the iOS output binary so it can
     be deployed to a device.  This should be run as the very last step of the
     build."""
-    if not (self.isIOS and self.spec['type'] == "executable"):
+    if not (self.isIOS and (self.spec['type'] == "executable" or
+        self.spec['type'] == "extension")):
       return []
 
     settings = self.xcode_settings[configname]
@@ -1402,7 +1423,11 @@ def _GetXcodeEnv(xcode_settings, built_products_dir, srcroot, configuration,
     env['SDKROOT'] = ''
 
   if spec['type'] in (
-      'executable', 'static_library', 'shared_library', 'loadable_module'):
+      'executable',
+      'extension',
+      'static_library',
+      'shared_library',
+      'loadable_module'):
     env['EXECUTABLE_NAME'] = xcode_settings.GetExecutableName()
     env['EXECUTABLE_PATH'] = xcode_settings.GetExecutablePath()
     env['FULL_PRODUCT_NAME'] = xcode_settings.GetFullProductName()