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

webrtc/base/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/crypto.gni")
 import("//build/config/ui.gni")
@@ skipping 169 matching lines @@
     include_dirs = [ "../../webrtc_overrides" ]
   } else {
     sources += [
       "logging.cc",
       "logging.h",
       "logging_mac.mm",
     ]
   }
 }
 
+config("enable_libevent_config") {
+  defines = [ "WEBRTC_BUILD_LIBEVENT" ]
+}
+
 static_library("rtc_task_queue") {
   public_deps = [
     ":rtc_base_approved",
   ]
   configs += [ "..:common_config" ]
 
   sources = [
     "sequenced_task_checker.h",
     "sequenced_task_checker_impl.cc",
     "sequenced_task_checker_impl.h",
     "task_queue.h",
     "task_queue_posix.h",
   ]
 
   if (rtc_build_libevent) {
     deps = [
       "//base/third_party/libevent",
     ]
   }
 
   if (rtc_enable_libevent) {
     sources += [
       "task_queue_libevent.cc",
       "task_queue_posix.cc",
     ]
+    all_dependent_configs = [ ":enable_libevent_config" ]
   } else {
     if (is_mac || is_ios) {
       sources += [
         "task_queue_gcd.cc",
         "task_queue_posix.cc",
       ]
     }
     if (is_win) {
       sources += [ "task_queue_win.cc" ]
     }
@@ skipping 473 matching lines @@
       "java/src/org/webrtc/Logging.java",
       "java/src/org/webrtc/Size.java",
       "java/src/org/webrtc/ThreadUtils.java",
     ]
 
     deps = [
       "//base:base_java",
     ]
   }
 }