Moving LatencyInfo into a separate component.

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 176 matching lines @@
       "//third_party/WebKit/Source/web:webkit_unit_tests",
       "//third_party/angle/src/tests:angle_end2end_tests",
       "//third_party/angle/src/tests:angle_unittests",
       "//third_party/angle/src/tests:angle_white_box_tests",
       "//third_party/catapult/telemetry:bitmaptools($host_toolchain)",
       "//third_party/smhasher:pmurhash",
       "//tools/imagediff($host_toolchain)",
       "//ui/display:display_unittests",
       "//ui/events:events_unittests",
       "//ui/gl:gl_unittests",
+      "//ui/latency:latency_unittests",
       "//ui/touch_selection:ui_touch_selection_unittests",
       "//url/ipc:url_ipc_unittests",
     ]
   } else {
     deps += [ "//ios:all" ]
   }
 
   deps += root_extra_deps
 
   if (enable_extensions) {
@@ skipping 885 matching lines @@
   assert(target_name != "")  # Mark as used.
   sources = invoker.actual_sources
   assert(
       sources == invoker.actual_sources,
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
 assert_valid_out_dir("_unused") {
   actual_sources = [ "$root_build_dir/foo" ]
 }