Implement HitTestAggregator

components/viz/common/BUILD.gn

 # Copyright 2017 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")
 
 source_set("common") {
   sources = [
+    "display_hit_test_region.h",
     "gl_helper.cc",
     "gl_helper.h",
     "gl_helper_readback_support.cc",
     "gl_helper_readback_support.h",
     "gl_helper_scaling.cc",
     "gl_helper_scaling.h",
   ]
 
   deps = [
     "//gpu/command_buffer/client:gles2_interface",
+    "//services/viz/public/interfaces",
     "//skia",
     "//ui/gfx/geometry",
   ]
 
   public_deps = [
     "//gpu/command_buffer/client",
     "//gpu/command_buffer/common",
   ]
 }
 
@@ skipping 44 matching lines @@
     "//gpu/ipc:gl_in_process_context",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/gfx",
   ]
 
   data_deps = [
     "//third_party/mesa:osmesa",
   ]
 }