Add viz-host HitTestQuery.

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.
 
 source_set("common") {
   sources = [
+    "display_hit_test_data.h",

[rjkroege, 2017/06/28 18:46:43]

display_hit_test_region.h is the name name I thinks. And, do you want to rebase
above gary's?

     "server_gpu_memory_buffer_manager.cc",
     "server_gpu_memory_buffer_manager.h",
   ]
 
   deps = [
     "//gpu/ipc/client",
     "//gpu/ipc/common",
     "//services/ui/gpu/interfaces",
   ]
 
@@ skipping 10 matching lines @@
     "server_gpu_memory_buffer_manager_unittest.cc",
   ]
 
   deps = [
     ":common",
     "//base/test:test_support",
     "//services/ui/gpu/interfaces",
     "//testing/gtest",
   ]
 }