Implement HitTestAggregator

components/viz/service/BUILD.gn

Index: components/viz/service/BUILD.gn
diff --git a/components/viz/service/BUILD.gn b/components/viz/service/BUILD.gn
index 5d8e58859e094a843cf3b183d60af268c1543b52..78f5b22a346c8c2988647bcd0e4685e389a1937b 100644
--- a/components/viz/service/BUILD.gn
+++ b/components/viz/service/BUILD.gn
@@ -50,6 +50,8 @@ viz_component("service") {
     "frame_sinks/gpu_compositor_frame_sink_delegate.h",
     "frame_sinks/gpu_root_compositor_frame_sink.cc",
     "frame_sinks/gpu_root_compositor_frame_sink.h",
+    "hit_test/hit_test_aggregator.cc",
+    "hit_test/hit_test_aggregator.h",
     "viz_service_export.h",
   ]
 
@@ -76,6 +78,7 @@ viz_component("service") {
     "//cc/surfaces",
     "//gpu/command_buffer/client:gles2_interface",
     "//gpu/ipc:command_buffer",
+    "//services/viz/hit_test/public/interfaces",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/latency",
@@ -126,6 +129,7 @@ viz_source_set("unit_tests") {
     "frame_sinks/compositor_frame_sink_support_unittest.cc",
     "frame_sinks/direct_layer_tree_frame_sink_unittest.cc",
     "frame_sinks/frame_sink_manager_unittest.cc",
+    "hit_test/hit_test_aggregator_unittest.cc",
   ]
 
   if (!use_aura && !is_mac) {
@@ -143,6 +147,12 @@ viz_source_set("unit_tests") {
     "//base/test:test_support",
     "//cc:test_support",
     "//components/viz/common",
+    "//gpu/command_buffer/client",
+    "//gpu/command_buffer/client:gles2_implementation",
+    "//gpu/ipc:gl_in_process_context",
+    "//media",
+    "//services/viz/hit_test/public/interfaces",
+    "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/display/types",