Enabling 'gn check' on //webrtc/tools.

BUG=webrtc:6828
NOTRY=True

Review-Url: https://codereview.webrtc.org/2799633002
Cr-Commit-Position: refs/heads/master@{#17542}
diff --git a/.gn b/.gn
index 0976bb8..b101254 100644
--- a/.gn
+++ b/.gn
@@ -32,6 +32,7 @@
   "//webrtc/media/*",
   "//webrtc/modules/*",
   "//webrtc/stats/*",
+  "//webrtc/tools/*",
   "//webrtc/voice_engine/*",
 ]
 
diff --git a/webrtc/tools/BUILD.gn b/webrtc/tools/BUILD.gn
index 169a7f4..5a4c1af 100644
--- a/webrtc/tools/BUILD.gn
+++ b/webrtc/tools/BUILD.gn
@@ -48,6 +48,7 @@
   ]
   deps = [
     "../base:gtest_prod",
+    "../base:rtc_base_approved",
   ]
 }
 
@@ -141,6 +142,7 @@
   }
 
   deps = [
+    "..:webrtc_common",
     "../common_video",
   ]
 }
@@ -202,6 +204,7 @@
     }
     defines = [ "ENABLE_RTC_EVENT_LOG" ]
     deps = [
+      "../base:rtc_base_approved",
       "../call:call_interfaces",
       "../logging:rtc_event_log_impl",
       "../logging:rtc_event_log_parser",
@@ -258,6 +261,7 @@
     deps = [
       "../modules/audio_processing",
       "../system_wrappers:metrics_default",
+      "../test:test_support",
       "//build/win:default_exe_manifest",
       "//testing/gtest",
       "//third_party/gflags",