Add blimp to root GN check_targets

blimp/common/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//testing/test.gni")
 
 component("blimp_common") {
   sources = [
     "blimp_common_export.h",
     "blob_cache/blob_cache.h",
@@ skipping 31 matching lines @@
   testonly = true
 
   sources = [
     "blob_cache/in_memory_blob_cache_unittest.cc",
     "create_blimp_message_unittest.cc",
     "logging_unittest.cc",
   ]
 
   deps = [
     ":blimp_common",
+    "//base",
     "//blimp/common/proto",
+    "//blimp/net:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }