[Hacky prototype] Create a shared-memory high-performance reporting service.

services/blamer/public/interfaces/service_constants.mojom

Index: services/blamer/public/interfaces/service_constants.mojom
diff --git a/services/blamer/public/interfaces/service_constants.mojom b/services/blamer/public/interfaces/service_constants.mojom
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+// 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.
+
+module blamer.mojom;
+
+const string kServiceName = "blamer";
+
+// The page size to be used by all instances of PersistentMemoryAllocator
+// owned by the service.
+const uint32 kPageSize = 4096;