Add viz-host HitTestQuery.

components/viz/host/hit_test/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")
+
+# TODO(riajiang): Integrate with https://codereview.chromium.org/2908783002/.
+source_set("hit_test") {
+  sources = [
+    "components/viz/common/display_hit_test_data.h",

[sadrul, 2017/06/16 17:09:51]

I assume you meant //components...? (it's weird that you are not getting errors
from this).

However, you should not include sources from other directories in here. Instead,
some target in //components/viz/common/BUILD.gn should include this file as a
source, and this target should have a dep on that target.

[riajiang, 2017/06/23 02:46:36]

Yea I meant //components. Added BUILD.gn to components/viz/common/hit_test and
dep on that from here.

+    "hit_test_query.cc",
+    "hit_test_query.h",
+  ]
+
+  public_deps = [
+    "//cc/surfaces:surface_id",
+    "//ui/gfx",
+    "//ui/gfx/geometry",
+  ]
+}
+
+test("viz_hit_test_unittests") {
+  testonly = true
+
+  sources = [
+    "hit_test_query_unittest.cc",
+  ]
+
+  deps = [
+    ":hit_test",
+    "//base",
+    "//base/test:run_all_unittests",
+    "//base/test:test_support",
+    "//cc:test_support",
+    "//testing/gtest",
+  ]
+}