[Reland] Optimize blink scheduler with an intrusive heap

third_party/WebKit/Source/platform/BUILD.gn

Index: third_party/WebKit/Source/platform/BUILD.gn
diff --git a/third_party/WebKit/Source/platform/BUILD.gn b/third_party/WebKit/Source/platform/BUILD.gn
index cf3ac13e886235b6ed1411a80017abbcce84ee78..545c43c04c00f37c3423ff9d49f9601a630169de 100644
--- a/third_party/WebKit/Source/platform/BUILD.gn
+++ b/third_party/WebKit/Source/platform/BUILD.gn
@@ -1126,6 +1126,7 @@ component("platform") {
     "scheduler/base/cancelable_closure_holder.h",
     "scheduler/base/enqueue_order.cc",
     "scheduler/base/enqueue_order.h",
+    "scheduler/base/intrusive_heap.h",
     "scheduler/base/lazy_now.cc",
     "scheduler/base/lazy_now.h",
     "scheduler/base/pollable_thread_safe_flag.cc",
@@ -1702,6 +1703,7 @@ test("blink_platform_unittests") {
     "network/ResourceRequestTest.cpp",
     "network/ResourceResponseTest.cpp",
     "scheduler/CancellableTaskFactoryTest.cpp",
+    "scheduler/base/intrusive_heap_unittest.cc",
     "scheduler/base/queueing_time_estimator_unittest.cc",
     "scheduler/base/task_queue_manager_unittest.cc",
     "scheduler/base/task_queue_selector_unittest.cc",