Move printing defines to buildflag system.

printing/BUILD.gn

 # Copyright 2014 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/features.gni")
 import("//build/config/sysroot.gni")
 import("//build/config/ui.gni")
+import("//printing/features/features.gni")
 import("//testing/test.gni")
 if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
 }
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 component("printing") {
   sources = [
@@ skipping 49 matching lines @@
     "printing_context.h",
     "printing_utils.cc",
     "printing_utils.h",
     "units.cc",
     "units.h",
   ]
 
   cflags = []
   defines = [ "PRINTING_IMPLEMENTATION" ]
 
+  public_deps = [
+    "//printing/features",
+  ]
   deps = [
     "//base",
     "//base:i18n",
     "//base/third_party/dynamic_annotations",
     "//skia",
     "//third_party/icu",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//url",
   ]
@@ skipping 219 matching lines @@
       "android/java/src/org/chromium/printing/PrintManagerDelegate.java",
       "android/java/src/org/chromium/printing/PrintManagerDelegateImpl.java",
       "android/java/src/org/chromium/printing/Printable.java",
       "android/java/src/org/chromium/printing/PrintingContext.java",
       "android/java/src/org/chromium/printing/PrintingContextInterface.java",
       "android/java/src/org/chromium/printing/PrintingController.java",
       "android/java/src/org/chromium/printing/PrintingControllerImpl.java",
     ]
   }
 }