diff --git a/DEPS b/DEPS
index ed90955c..7ef8947 100644
--- a/DEPS
+++ b/DEPS
@@ -44,7 +44,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.
-  'v8_revision': '21443fab7c619a1ddb08fd0305adb9b2c415d933',
+  'v8_revision': '5ea931aa84f9bd3970b5d95ac5f2cc8243012bff',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling swarming_client
   # and whatever else without interference from each other.
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/test_exporter.py b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/test_exporter.py
index 2124534..599b48d8 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/test_exporter.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/test_exporter.py
@@ -98,6 +98,10 @@
 
         _log.info('Create PR response: %s', response_data)
 
+        if response_data:
+            data, status_code = self.wpt_github.add_label(response_data['number'])
+            _log.info('Add label response (status %s): %s', status_code, data)
+
     def exportable_commits_since(self, commit):
         """Returns SHAs of exportable commits since `commit` in chronological order.
 
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/wpt_github.py b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/wpt_github.py
index 655c214..16a192df 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/wpt_github.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/wpt_github.py
@@ -30,6 +30,19 @@
     def auth_token(self):
         return base64.encodestring('{}:{}'.format(self.user, self.token)).strip()
 
+    def request(self, path, method, body=None):
+        assert path.startswith('/')
+        if body:
+            body = json.dumps(body)
+        opener = urllib2.build_opener(urllib2.HTTPHandler)
+        request = urllib2.Request(url=API_BASE + path, data=body)
+        request.add_header('Accept', 'application/vnd.github.v3+json')
+        request.add_header('Authorization', 'Basic {}'.format(self.auth_token()))
+        request.get_method = lambda: method
+        response = opener.open(request)
+        status_code = response.getcode()
+        return json.load(response), status_code
+
     def create_pr(self, local_branch_name, desc_title, body):
         """Creates a PR on GitHub.
 
@@ -52,41 +65,32 @@
             "body": body,
             "head": pr_branch_name,
             "base": 'master',
-            "labels": [EXPORT_LABEL]
         }
-        data, status_code = self.request(path, body)
+        data, status_code = self.request(path, method='POST', body=body)
 
         if status_code != 201:
             return None
 
         return data
 
+    def add_label(self, number):
+        path = '/repos/w3c/web-platform-tests/issues/%d/labels' % number
+        body = [EXPORT_LABEL]
+        return self.request(path, method='POST', body=body)
+
     def in_flight_pull_requests(self):
         url_encoded_label = EXPORT_LABEL.replace(' ', '%20')
         path = '/search/issues?q=repo:w3c/web-platform-tests%20is:open%20type:pr%20labels:{}'.format(url_encoded_label)
-        data, status_code = self.request(path)
+        data, status_code = self.request(path, method='GET')
         if status_code == 200:
             return data['items']
         else:
             raise Exception('Non-200 status code (%s): %s' % (status_code, data))
 
-    def request(self, path, body=None):
-        assert path.startswith('/')
-
-        if body:
-            body = json.dumps(body)
-
-        req = urllib2.Request(url=API_BASE + path, data=body)
-        req.add_header('Accept', 'application/vnd.github.v3+json')
-        req.add_header('Authorization', 'Basic {}'.format(self.auth_token()))
-        res = urllib2.urlopen(req)
-        status_code = res.getcode()
-        return json.load(res), status_code
-
     def merge_pull_request(self, pull_request_number):
         path = '/repos/w3c/web-platform-tests/pulls/%d/merge' % pull_request_number
         body = {}
-        response, content = self.request(path, body)
+        response, content = self.request(path, method='PUT', body=body)
 
         if response['status'] == '200':
             return json.loads(content)