[omnibox] Added 'OmniboxTailSuggestions' flag

chrome/browser/flag_descriptions.h

Index: chrome/browser/flag_descriptions.h
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index c2df124fed865d9bbca7767b967e6fd6b84f46a8..45af38e9cdcb62e709abfeb6cd385e463f4c63d7 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -1385,6 +1385,9 @@ extern const char kEnableNewAppMenuIconDescription[];
 extern const char kOmniboxEntitySuggestionsName[];
 extern const char kOmniboxEntitySuggestionsDescription[];
 
+extern const char kOmniboxTailSuggestionsName[];

[Mark P, 2017/05/31 23:17:13]

Uh, how does this compile?  This is only defined for !OS_IOS blocks, yet the
code in about flags is enabled for IOS.  (I think IOS passes OS_MACOSX test in
the about flags file.  Yet the entity code compiles.  /confused)

[Kevin Bailey, 2017/06/01 14:32:42]

I believe IOS is not a subset of MACOS. I had assumed CHROMEOS was a subset of
LINUX but was wrong. I suspect it would become too verbose to have to put MACOS
&& !IOS all over the place. 2 IOS bots compiled successfully.

+extern const char kOmniboxTailSuggestionsDescription[];
+
 extern const char kOneGoogleBarOnLocalNtpName[];
 extern const char kOneGoogleBarOnLocalNtpDescription[];