Move blink scheduler implementation into a component

components/scheduler/BUILD.gn

+# Copyright 2015 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("//components/scheduler/scheduler.gni")
+
+# GYP version: components/scheduler.gypi:scheduler
+component("scheduler") {
+  sources = rebase_path(scheduler_gypi_values.scheduler_sources,
+                        ".",
+                        "//components/scheduler")
+
+  defines = [ "SCHEDULER_IMPLEMENTATION" ]
+
+  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
+
+  deps = [
+    ":common",
+    "//base",
+    "//cc:cc",
+    "//third_party/WebKit/public:blink",
+    "//ui/gfx:gfx",
+  ]
+}
+
+# GYP version: components/scheduler.gypi:scheduler_common
+source_set("common") {
+  sources = rebase_path(scheduler_gypi_values.scheduler_common_sources,
+                        ".",
+                        "//components/scheduler")
+}
+
+source_set("unit_tests") {
+  testonly = true
+
+  sources = [
+    "child/nestable_task_runner_for_test.cc",
+    "child/nestable_task_runner_for_test.h",
+    "child/prioritizing_task_queue_selector_unittest.cc",
+    "child/scheduler_helper_unittest.cc",
+    "child/task_queue_manager_unittest.cc",
+    "child/test_time_source.cc",
+    "child/test_time_source.h",
+    "child/worker_scheduler_impl_unittest.cc",
+    "renderer/deadline_task_runner_unittest.cc",
+    "renderer/renderer_scheduler_impl_unittest.cc",
+  ]
+
+  deps = [
+    ":scheduler",
+    "//cc:test_support",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+}