Add a gtk3 port of peerconnection_client on Linux

webrtc/examples/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")
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 } else if (is_mac) {
   import("//build/config/mac/rules.gni")
 } else if (is_ios) {
   import("//build/config/ios/rules.gni")
 }
-if (is_linux) {
-  import("//build/config/linux/pkg_config.gni")
-}
 
 group("examples") {
   # This target shall build all targets in examples.
   testonly = true
   public_deps = []
 
   if (is_android) {
     public_deps += [
       ":AppRTCMobile",
       ":AppRTCMobileTest",
@@ skipping 394 matching lines @@
 
       configs += [
         ":rtc_apprtcmobile_config",
         "//build/config/compiler:enable_arc",
       ]
     }
   }
 }
 
 if (is_linux || is_win) {
-  if (is_linux) {
-    pkg_config("gtk2_config") {
-      # Gtk requires gmodule, but it does not list it as a dependency in some
-      # misconfigured systems.
-      packages = [
-        "gmodule-2.0",
-        "gtk+-2.0",
-        "gthread-2.0",
-      ]
-    }
-  }
-
   config("peerconnection_client_warnings_config") {
     cflags = []
     if (is_win && is_clang) {
       cflags += [
         # Disable warnings failing when compiling with Clang on Windows.
         # https://bugs.chromium.org/p/webrtc/issues/detail?id=5366
         "-Wno-format",
 
         # See https://bugs.chromium.org/p/webrtc/issues/detail?id=6271
         # for -Wno-reorder and -Wno-sign-compare
@@ skipping 33 matching lines @@
     if (is_win) {
       sources += [
         "peerconnection/client/flagdefs.h",
         "peerconnection/client/main.cc",
         "peerconnection/client/main_wnd.cc",
         "peerconnection/client/main_wnd.h",
       ]
       cflags = [ "/wd4245" ]
       configs += [ "//build/config/win:windowed" ]
     }
+    deps = [
+      "//third_party/libyuv",
+      "//webrtc/api:libjingle_peerconnection",
+      "//webrtc/system_wrappers:field_trial_default",
+      "//webrtc/system_wrappers:metrics_default",
+    ]
     if (is_linux) {
       sources += [
         "peerconnection/client/linux/main.cc",
         "peerconnection/client/linux/main_wnd.cc",
         "peerconnection/client/linux/main_wnd.h",
       ]
       libs = [
         "X11",
         "Xcomposite",
         "Xext",
         "Xrender",
       ]
-      public_configs = [ ":gtk2_config" ]
+      deps += [ "//build/config/linux/gtk" ]
     }
-    deps = [
-      "//third_party/libyuv",
-      "//webrtc/api:libjingle_peerconnection",
-      "//webrtc/system_wrappers:field_trial_default",
-      "//webrtc/system_wrappers:metrics_default",
-    ]
     configs += [ ":peerconnection_client_warnings_config" ]
     if (rtc_build_json) {
       deps += [ "//third_party/jsoncpp" ]
     }
   }
 
   rtc_executable("peerconnection_server") {
     sources = [
       "peerconnection/server/data_socket.cc",
       "peerconnection/server/data_socket.h",
@@ skipping 73 matching lines @@
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
 
     deps = [
       "../p2p:libstunprober",
       "../p2p:rtc_p2p",
       "../system_wrappers:field_trial_default",
     ]
   }
 }