Count document.createEvent() usage

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

Index: third_party/WebKit/Source/build/scripts/make_event_factory.py
diff --git a/third_party/WebKit/Source/build/scripts/make_event_factory.py b/third_party/WebKit/Source/build/scripts/make_event_factory.py
index aa87658f566846a906dffccc7e3b842533af0a4a..7a9d9c28e02cf12d0c26a3ef4abef78dc00650e2 100755
--- a/third_party/WebKit/Source/build/scripts/make_event_factory.py
+++ b/third_party/WebKit/Source/build/scripts/make_event_factory.py
@@ -47,6 +47,11 @@ HEADER_TEMPLATE = """%(license)s
 """
 
 
+# The list is a close match to:
+#
+# https://dom.spec.whatwg.org/#dom-document-createevent
+#
+# with the exepction for |keyevents| not present in Blink.

[philipj_slow, 2016/02/13 14:29:58]

https://github.com/whatwg/dom/issues/148

 def case_insensitive_matching(name):
     return (name == ('HTMLEvents')
             or name == 'Event'
@@ -59,6 +64,21 @@ def case_insensitive_matching(name):
             or name == 'TouchEvent')
 
 
+# All events not on the following whitelist are being measured in
+# createEvent. The plan is to limit createEvent to just a few selected
+# events necessary for legacy content in accordance with the
+# specification:
+#
+# https://dom.spec.whatwg.org/#dom-document-createevent
+def candidate_whitelist(name):
+    return (case_insensitive_matching(name)
+            or name == 'SVGZoomEvent'  # Will be deprecated instead.
+            or name == 'SVGZoomEvents')  # Will be deprecated instead.
+
+
+def measure_name(name):
+    return 'DocumentCreateEvent' + name
+
 class EventFactoryWriter(in_generator.Writer):
     defaults = {
         'ImplementedAs': None,
@@ -74,6 +94,8 @@ class EventFactoryWriter(in_generator.Writer):
         'lower_first': name_utilities.lower_first,
         'case_insensitive_matching': case_insensitive_matching,
         'script_name': name_utilities.script_name,
+        'candidate_whitelist': candidate_whitelist,
+        'measure_name': measure_name,
     }
 
     def __init__(self, in_file_path):