Add an experiment to avoid memory pressure broadcasts.

base/feature_list.h

Index: base/feature_list.h
diff --git a/base/feature_list.h b/base/feature_list.h
index c9f4a7b0c462805dfd622ef68317634bae251956..aac2e530a390542c063c73c8de38f757f5eae04f 100644
--- a/base/feature_list.h
+++ b/base/feature_list.h
@@ -73,6 +73,9 @@ struct BASE_EXPORT Feature {
 // After initialization (which should be done single-threaded), the FeatureList
 // API is thread safe.
 //
+// To integrate with Finch for experimental control, Googlers can read
+// go/finch-feature-api
+//
 // Note: This class is a singleton, but does not use base/memory/singleton.h in
 // order to have control over its initialization sequence. Specifically, the
 // intended use is to create an instance of this class and fully initialize it,