Fix dependencies on mac in tools/BUILD.gn.

webrtc/tools/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/webrtc.gni")
 
@@ skipping 29 matching lines @@
 }
 
 executable("frame_analyzer") {
   sources = [
     "frame_analyzer/frame_analyzer.cc",
   ]
   deps = [
     ":command_line_parser",
     ":video_quality_analysis",
   ]
+  if (is_mac) {
+    libs = [ "Foundation.framework" ]
+  }
 }
 
 executable("rgba_to_i420_converter") {
   sources = [
     "converter/converter.cc",
     "converter/converter.h",
     "converter/rgba_to_i420_converter.cc",
   ]
   deps = [
     ":command_line_parser",
     "../common_video",
   ]
+  if (is_mac) {
+    libs = [ "Foundation.framework" ]
+  }
 }
 
 # TODO(kjellander): Convert all of tools.gyp into GN here.
 
 if (!build_with_chromium) {
   executable("tools_unittests") {
     testonly = true
 
     sources = [
       "simple_command_line_parser_unittest.cc",
     ]
 
     configs += [ "..:common_config" ]
     public_configs = [ "..:common_inherited_config" ]
 
     deps = [
       ":command_line_parser",
       "../test:test_support_main",
       "//testing/gtest",
     ]
+    if (is_mac) {
+      libs = [ "Foundation.framework" ]
+    }
   }
 }