Move printing defines to buildflag system.

chrome/common/features.gni

Index: chrome/common/features.gni
diff --git a/chrome/common/features.gni b/chrome/common/features.gni
index 4af019cfaa449188dab399fdf7e2ecc71b2880c0..85bdbe559c943673344f85163938257d5d7d3e46 100644
--- a/chrome/common/features.gni
+++ b/chrome/common/features.gni
@@ -6,6 +6,7 @@ import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/features.gni")
+import("//printing/features/features.gni")
 
 # Please keep features in alphabetical order.
 declare_args() {
@@ -67,12 +68,16 @@ declare_args() {
   use_vulcanize = true
 }
 
+_enable_printing = enable_basic_printing || enable_print_preview

[Lei Zhang, 2016/10/28 21:49:49]

Does the leading underscore mean it's a local variable?

[brettw, 2016/10/28 22:20:54]

Yes, it won't get exposed to files that import this one.

+
 chrome_grit_defines = [
   "enable_app_list=$enable_app_list",
   "enable_background=$enable_background",
   "enable_google_now=$enable_google_now",
   "enable_hangout_services_extension=$enable_hangout_services_extension",
   "enable_hotwording=$enable_hotwording",
+  "enable_print_preview=$enable_print_preview",
+  "enable_printing=$_enable_printing",
   "enable_service_discovery=$enable_service_discovery",
   "enable_vr_shell=$enable_vr_shell",
   "enable_webvr=$enable_webvr",