Convert ChromeViewHostMsg_UpdatedCacheStats to use mojo.

chrome/browser/cache_stats_recorder.h

Index: chrome/browser/cache_stats_recorder.h
diff --git a/chrome/browser/cache_stats_recorder.h b/chrome/browser/cache_stats_recorder.h
new file mode 100644
index 0000000000000000000000000000000000000000..4265832ab0fb033cff548be4073a1fea35eed04c
--- /dev/null
+++ b/chrome/browser/cache_stats_recorder.h
@@ -0,0 +1,31 @@
+// 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.
+
+#ifndef CHROME_BROWSER_CACHE_STATS_RECORDER_H_
+#define CHROME_BROWSER_CACHE_STATS_RECORDER_H_
+
+#include "base/threading/thread_checker.h"
+#include "chrome/common/cache_stats_recorder.mojom.h"
+
+class CacheStatsRecorder : public chrome::mojom::CacheStatsRecorder {
+ public:
+  explicit CacheStatsRecorder(int render_process_id);
+  ~CacheStatsRecorder() override;
+
+  static void Create(
+      int render_process_id,
+      chrome::mojom::CacheStatsRecorderAssociatedRequest request);
+
+ private:
+  // chrome::mojom::CacheStatsRecorder:
+  void RecordCacheStats(uint64_t capacity, uint64_t size) override;
+
+  const int render_process_id_;
+
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(CacheStatsRecorder);
+};
+
+#endif  // CHROME_BROWSER_CACHE_STATS_RECORDER_H_