Move WEBRTC_BUILD_LIBEVENT definition to base/BUILD.gn and base/base.gyp. This use all_dependent_co…

webrtc/base/BUILD.gn

Index: webrtc/base/BUILD.gn
diff --git a/webrtc/base/BUILD.gn b/webrtc/base/BUILD.gn
index e7ed156ade9d9cbf12591db69791af8137d6d280..110ee479ec5b90a632d7703a66a5044e4d1ceee8 100644
--- a/webrtc/base/BUILD.gn
+++ b/webrtc/base/BUILD.gn
@@ -187,6 +187,12 @@ static_library("rtc_base_approved") {
   }
 }
 
+config("enable_libevent_config") {
+  defines = [
+    "WEBRTC_BUILD_LIBEVENT",
+  ]
+}
+
 static_library("rtc_task_queue") {
   public_deps = [
     ":rtc_base_approved",
@@ -212,6 +218,9 @@ static_library("rtc_task_queue") {
       "task_queue_libevent.cc",
       "task_queue_posix.cc",
     ]
+    all_dependent_configs = [

[tommi, 2016/07/14 21:47:44]

Does this also mean that enable_libevent_config is a dependency of
rtc_task_queue?  (i.e. that the define is set for the current target too, not
just dependent ones)

[perkj_webrtc, 2016/07/15 06:26:18]

yes, for gn but not gyp.

+        ":enable_libevent_config"
+    ]
   } else {
     if (is_mac || is_ios) {
       sources += [