[Origin Trials] Install origin trial bindings on V8 context conditionally

third_party/WebKit/Source/bindings/templates/partial_interface.h

Index: third_party/WebKit/Source/bindings/templates/partial_interface.h
diff --git a/third_party/WebKit/Source/bindings/templates/partial_interface.h b/third_party/WebKit/Source/bindings/templates/partial_interface.h
index 337b3cc1a89bc30e365c900daf203861d2843726..512cf62539e4f1ae898d15d2a794ba42e543b073 100644
--- a/third_party/WebKit/Source/bindings/templates/partial_interface.h
+++ b/third_party/WebKit/Source/bindings/templates/partial_interface.h
@@ -7,6 +7,9 @@
 {% endfor %}
 
 namespace blink {
+{% if attributes|origin_trial_enabled_attributes %}
+class ScriptState;
+{% endif %}
 
 class {{v8_class_or_partial}} {
     STATIC_ONLY({{v8_class_or_partial}});
@@ -25,6 +28,9 @@ public:
     {% endfor %}
     {# Custom internal fields #}
     static void preparePrototypeAndInterfaceObject(v8::Local<v8::Context>, const DOMWrapperWorld&, v8::Local<v8::Object>, v8::Local<v8::Function>, v8::Local<v8::FunctionTemplate>);
+    {% for group in attributes|origin_trial_enabled_attributes|groupby('origin_trial_feature_name') %}{{newline}}
+    static void install{{group.grouper}}(ScriptState*, v8::Local<v8::Object> instance);
+    {% endfor %}
 private:
     static void install{{v8_class}}Template(v8::Isolate*, const DOMWrapperWorld&, v8::Local<v8::FunctionTemplate> interfaceTemplate);
 };