[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 07ba9cb5a1d0f7b23ab914cf10051dca7251856a..d0e05a7e57d15bae4c71daa79e992bcb2966abb7 100644
--- a/third_party/WebKit/Source/platform/BUILD.gn
+++ b/third_party/WebKit/Source/platform/BUILD.gn
@@ -1128,6 +1128,7 @@ 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",
@@ -1706,6 +1707,7 @@ 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",