Omnibox UI Experiments: Implement elide-after-host experiment.

components/url_formatter/url_formatter.h

Index: components/url_formatter/url_formatter.h
diff --git a/components/url_formatter/url_formatter.h b/components/url_formatter/url_formatter.h
index 90f2bbf9b73128e35a080382b35fe91d08db3d09..3e01b2ef67b23dddec28a0e89a5ad4dacf4daba8 100644
--- a/components/url_formatter/url_formatter.h
+++ b/components/url_formatter/url_formatter.h
@@ -51,9 +51,14 @@ extern const FormatUrlType kFormatUrlOmitHTTP;
 // meaningful for non-file "standard" URLs.
 extern const FormatUrlType kFormatUrlOmitTrailingSlashOnBareHostname;
 
-// Convenience for omitting all unecessary types.
+// Convenience for omitting all unecessary types. Does not include experimental
+// flags below.
 extern const FormatUrlType kFormatUrlOmitAll;
 
+// Replaces the path, query, and ref with an ellipsis. Experimental and not in
+// kFormatUrlOmitAll.
+extern const FormatUrlType kFormatUrlExperimentalElideAfterHost;
+
 // Creates a string representation of |url|. The IDN host name is turned to
 // Unicode if the Unicode representation is deemed safe. |format_type| is a
 // bitmask of FormatUrlTypes, see it for details. |unescape_rules| defines how