Add Mojo API for Blink hit testing

content/browser/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/buildflag_header.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//gpu/vulkan/features.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
@@ skipping 115 matching lines @@
     "//services/service_manager/public/interfaces",
     "//services/service_manager/runner/common",
     "//services/service_manager/runner/host:lib",
     "//services/shape_detection:lib",
     "//services/shape_detection/public/interfaces",
     "//services/ui/gpu/interfaces",
     "//services/ui/public/cpp/gpu",
     "//services/video_capture/public/cpp",
     "//services/video_capture/public/interfaces:constants",
     "//services/video_capture/public/uma",
+    "//services/viz/public/interfaces/hit_test",
     "//skia",
     "//sql",
     "//storage/browser",
     "//storage/common",
     "//third_party/WebKit/common:blink_common",
     "//third_party/WebKit/public:blink_headers",
     "//third_party/WebKit/public:features",
     "//third_party/WebKit/public:image_resources",
     "//third_party/WebKit/public:mojo_bindings",
     "//third_party/WebKit/public:resources",
@@ skipping 2045 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }