Added flags for PrintBrowser mode

printing/features/features.gni

 # Copyright 2016 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.
 
 import("//build/config/chromecast_build.gni")
 import("//build/config/features.gni")
 
 declare_args() {
   # Enable basic printing support and UI.
   enable_basic_printing = !is_chromecast && !is_ios
 
   # Enable printing with print preview. It does not imply
   # enable_basic_printing. It's possible to build Chrome with preview only.
   enable_print_preview = !is_android && !is_chromecast && !is_ios
 
   use_cups = (is_desktop_linux || is_mac) && !is_chromecast
 }
 
+declare_args() {
+  # Enable printing mode browsing. Implies enable_print_preview.

[Vitaly Buka (NO REVIEWS), 2016/12/12 05:29:48]

Code implies opposite.

[gozzard, 2016/12/14 23:14:48]

The implication logic is in another file. This determines the default value for
the build flag. Fixed

+  enable_print_browser = enable_print_preview
+}
+
 if ((enable_basic_printing && is_win) || enable_print_preview) {
   # Windows basic printing or print preview requires pdf enabled.
   assert(enable_pdf,
          "Windows basic printing or print preview needs pdf: " +
              "set enable_pdf=true.")
 }