[omnibox] Added 'OmniboxTailSuggestions' flag

chrome/browser/flag_descriptions.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_FLAG_DESCRIPTIONS_H_
 #define CHROME_BROWSER_FLAG_DESCRIPTIONS_H_
 
 // Includes needed for macros allowing conditional compilation of some strings.
 #include "build/build_config.h"
 #include "build/buildflag.h"
@@ skipping 1367 matching lines @@
 // Desktop --------------------------------------------------------------------
 
 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 
 extern const char kEnableNewAppMenuIconName[];
 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[];
 
 extern const char kPauseBackgroundTabsName[];
 extern const char kPauseBackgroundTabsDescription[];
 
 extern const char kUseGoogleLocalNtpName[];
 extern const char kUseGoogleLocalNtpDescription[];
 
 #endif
@@ skipping 94 matching lines @@
 #endif  // defined(TOOLKIT_VIEWS) || defined(OS_ANDROID)
 
 // ============================================================================
 // Don't just add flags to the end, put them in the right section in
 // alphabetical order. See top instructions for more.
 // ============================================================================
 
 }  // namespace flag_descriptions
 
 #endif  // CHROME_BROWSER_FLAG_DESCRIPTIONS_H_