Report utility process JS memory in task manager.

chrome/common/resource_usage_reporter.mojom

Index: chrome/common/resource_usage_reporter.mojom
diff --git a/chrome/common/resource_usage_reporter.mojom b/chrome/common/resource_usage_reporter.mojom
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+// 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.
+
+struct ResourceUsageData {
+  bool reports_v8_stats = false;
+  uint64 v8_memory_allocated = 0;
+  uint64 v8_memory_used = 0;
+
+  // TODO(amistry): Consider using this for the renderer process.
+};
+
+interface ResourceUsageReporter {
+  GetUsageData() => (ResourceUsageData data);
+};