Merged all PointerToId functions into TraceHelper::PointerToString.

third_party/WebKit/Source/platform/scheduler/base/trace_helper.cc

+// Copyright 2017 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.
+
+#include "platform/scheduler/base/trace_helper.h"
+
+#include "base/format_macros.h"
+#include "base/strings/stringprintf.h"
+
+namespace blink {
+namespace scheduler {
+namespace trace_helper {
+
+std::string PointerToString(const void* pointer) {
+  return base::StringPrintf(
+      "0x%" PRIx64,
+      static_cast<uint64_t>(reinterpret_cast<uintptr_t>(pointer)));
+}
+
+}  // namespace trace_helper
+}  // namespace scheduler
+}  // namespace blink