Add IPC benchmarking API to Blink TestRunner

content/shell/BUILD.gn

 # Copyright 2014 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("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
@@ skipping 97 matching lines @@
     "common/shell_test_configuration.cc",
     "common/shell_test_configuration.h",
     "common/test_runner/test_preferences.cc",
     "common/test_runner/test_preferences.h",
     "common/webkit_test_helpers.cc",
     "common/webkit_test_helpers.h",
     "geolocation/shell_access_token_store.cc",
     "geolocation/shell_access_token_store.h",
     "renderer/gc_controller.cc",
     "renderer/gc_controller.h",
+    "renderer/ipc_echo.cc",
+    "renderer/ipc_echo.h",
     "renderer/leak_detector.cc",
     "renderer/leak_detector.h",
     "renderer/shell_content_renderer_client.cc",
     "renderer/shell_content_renderer_client.h",
     "renderer/shell_render_frame_observer.cc",
     "renderer/shell_render_frame_observer.h",
     "renderer/shell_render_process_observer.cc",
     "renderer/shell_render_process_observer.h",
     "renderer/shell_render_view_observer.cc",
     "renderer/shell_render_view_observer.h",
@@ skipping 326 matching lines @@
   }
 
   if (!is_android || !is_android_webview_build) {
     # Some tests rely on this tool. It might be nicer if these tests relied on
     # image diff rather than having content shell depend on it.
     datadeps = [
       "//tools/imagediff($host_toolchain)",
     ]
   }
 }