Move blimp/net/test_common.h/cc to a separate source_set.

blimp/client/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.
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 component("blimp_client") {
@@ skipping 38 matching lines @@
     "compositor/render_widget_message_processor_unittest.cc",
   ]
 
   deps = [
     ":blimp_client",
     "//base",
     "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//blimp/common/proto",
     "//blimp/net:blimp_net",
+    "//blimp/net:test_support",
     "//cc/proto",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }
 
 if (is_android) {
   manifest_package = "org.chromium.blimp"
   blimp_apk_manifest = "$target_gen_dir/blimp_apk_manifest/AndroidManifest.xml"
   blimp_test_apk_manifest =
@@ skipping 167 matching lines @@
     apk_name = "BlimpTest"
     apk_under_test = ":blimp_apk"
     android_manifest = blimp_test_apk_manifest
     deps = [
       ":blimp_test_apk_manifest",
       ":blimp_test_java",
       google_play_services_resources,
     ]
   }
 }