Made CSSPropertyAPIWillChange which implements API for will-change

third_party/WebKit/Source/build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl

Index: third_party/WebKit/Source/build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl
diff --git a/third_party/WebKit/Source/build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl b/third_party/WebKit/Source/build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl
index 238f429a944678bf4151282e07d1ec720a88dbea..457060f0e4c2e1601451339999db441ff99cb75c 100644
--- a/third_party/WebKit/Source/build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl
+++ b/third_party/WebKit/Source/build/scripts/templates/CSSPropertyDescriptor.cpp.tmpl
@@ -21,7 +21,7 @@ static CSSPropertyDescriptor cssPropertyDescriptors[] = {
     // When functions are added to CSSPropertyAPI, also add them to the struct
     // initaliser below.
     {% for api_class in api_classes %}
-    { {{api_class.classname}}::parseSingleValue, true }
+    { {{api_class.classname}}::parseSingleValue, true },
     {% endfor %}
 };