Reland of "[heap] Parallel newspace evacuation, semispace copy, and compaction \o/"

src/utils-inl.h

Index: src/utils-inl.h
diff --git a/src/utils-inl.h b/src/utils-inl.h
new file mode 100644
index 0000000000000000000000000000000000000000..617d7fc151f5668769e346c129b9cd664a9b2a85
--- /dev/null
+++ b/src/utils-inl.h
@@ -0,0 +1,37 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_UTILS_INL_H_
+#define V8_UTILS_INL_H_
+
+#include "src/utils.h"
+
+#include "include/v8-platform.h"
+#include "src/base/platform/time.h"
+#include "src/v8.h"
+
+namespace v8 {
+namespace internal {
+
+class TimedScope {
+ public:
+  explicit TimedScope(double* result)
+      : start_(TimestampMs()), result_(result) {}
+
+  ~TimedScope() { *result_ = TimestampMs() - start_; }
+
+ private:
+  static inline double TimestampMs() {
+    return V8::GetCurrentPlatform()->MonotonicallyIncreasingTime() *
+           static_cast<double>(base::Time::kMillisecondsPerSecond);
+  }
+
+  double start_;
+  double* result_;
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_UTILS_INL_H_