GN: New conventions, default target and refactorings

webrtc/logging/BUILD.gn

 # Copyright (c) 2016 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/webrtc.gni")
 import("//third_party/protobuf/proto_library.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
+group("logging") {
+  public_deps = [
+    ":rtc_event_log_impl",
+  ]
+  if (rtc_enable_protobuf) {
+    public_deps += [ ":rtc_event_log_parser" ]
+  }
+}
+
 rtc_source_set("rtc_event_log_api") {
   sources = [
     "rtc_event_log/rtc_event_log.h",
   ]
 }
 
 rtc_static_library("rtc_event_log_impl") {
   sources = [
     "rtc_event_log/ringbuffer.h",
     "rtc_event_log/rtc_event_log.cc",
@@ skipping 63 matching lines @@
       ":rtc_event_log_proto",
       "..:webrtc_common",
     ]
 
     if (!build_with_chromium && is_clang) {
       # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }
 }