More changes to support hermetic Xcode toolchain in GN.

third_party/WebKit/Source/build/scripts/in_generator.py

Index: third_party/WebKit/Source/build/scripts/in_generator.py
diff --git a/third_party/WebKit/Source/build/scripts/in_generator.py b/third_party/WebKit/Source/build/scripts/in_generator.py
index 841f00e51541280a62ee7448b32b3c163bbfbeec..e90e62da119ab158dec78effa686919118698a03 100644
--- a/third_party/WebKit/Source/build/scripts/in_generator.py
+++ b/third_party/WebKit/Source/build/scripts/in_generator.py
@@ -26,6 +26,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+import os
 import os.path
 import shlex
 import shutil
@@ -86,10 +87,16 @@ class Maker(object):
             exit(1)
 
         parser = optparse.OptionParser()
+
         parser.add_option("--gperf", default="gperf")
+        parser.add_option("--developer_dir",
+                          help='Path to Xcode.')
         parser.add_option("--output_dir", default=os.getcwd())
         options, args = parser.parse_args()
 
+        if options.developer_dir:
+            os.environ['DEVELOPER_DIR'] = options.developer_dir
+
         writer = self._writer_class(args)
         writer.set_gperf_path(options.gperf)
         writer.write_files(options.output_dir)