Add ENABLE_MEDIA_ROUTER define

build/config/BUILD.gn

 # Copyright (c) 2013 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/allocator.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/module_args/v8.gni")
 
@@ skipping 18 matching lines @@
   dcheck_always_on = false
 
   # Set to true to compile with the OpenGL ES 2.0 conformance tests.
   internal_gles2_conform_tests = false
 }
 
 # TODO(brettw) Most of these should be removed. Instead of global feature
 # flags, we should have more modular flags that apply only to a target and its
 # dependents. For example, depending on the "x11" meta-target should define
 # USE_X11 for all dependents so that everything that could use X11 gets the
 # define, but anything that doesn't depend on X11 doesn't see it.

[Nico, 2015/04/07 20:32:35]

Is this feasible for your feature? Or do you need the define in every single
translation unit?

[mark a. foltz, 2015/04/07 21:27:04]

It looks feasible.  There are probably a half dozen .gn files that would need
the define declared, so I reverted this declaration.

I didn't follow the comment about using a "meta-target." It seems like that
would add the define to all dependents, even if there were no #ifdef that used
it.

 #
 # For now we define these globally to match the current GYP build.
 config("feature_flags") {
   # TODO(brettw) most of these need to be parameterized.
   defines = [
     "CHROMIUM_BUILD",
     "V8_DEPRECATION_WARNINGS",  # Don't use deprecated V8 APIs anywhere.
   ]
 
   if (cld_version > 0) {
@@ skipping 93 matching lines @@
   if (is_asan) {
     defines += [
       "ADDRESS_SANITIZER",
       "MEMORY_TOOL_REPLACES_ALLOCATOR",
       "MEMORY_SANITIZER_INITIAL_SIZE",
     ]
   }
   if (enable_webrtc) {
     defines += [ "ENABLE_WEBRTC=1" ]
   }
+  if (enable_media_router) {
+    defines += [ "ENABLE_MEDIA_ROUTER=1" ]
+  }
   if (disable_ftp_support) {
     defines += [ "DISABLE_FTP_SUPPORT=1" ]
   }
   if (!enable_nacl) {
     defines += [ "DISABLE_NACL" ]
   }
   if (enable_extensions) {
     defines += [ "ENABLE_EXTENSIONS=1" ]
   }
   if (enable_configuration_policy) {
@@ skipping 168 matching lines @@
       "CoreFoundation.framework",
       "CoreGraphics.framework",
       "CoreText.framework",
       "Foundation.framework",
       "UIKit.framework",
     ]
   } else if (is_linux) {
     libs = [ "dl" ]
   }
 }