Copy the LocalSiteChar...Database file to RC/PM/persistence/site_data

ps1 is a simple file move and rename.
ps2 updates the content of the file (to rename the class etc).
ps3-4: Rename the file once more (to disk_site_data_store) and update the
name of the functions to use Store instead of Database.
ps6: The name is not site_data_store.

Bug: 961336
Change-Id: I9d94973e980f7a27fcb508237f8905fb7300cf72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1602599
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659090}

chrome/browser/BUILD.gn

@@ -1108,6 +1108,7 @@ jumbo_split_static_library("browser") {
     "performance_manager/performance_manager_clock.h",
     "performance_manager/performance_manager_tab_helper.cc",
     "performance_manager/performance_manager_tab_helper.h",
+    "performance_manager/persistence/site_data/disk_site_data_store.h",
     "performance_manager/public/graph/frame_node.h",
     "performance_manager/public/graph/graph.h",
     "performance_manager/public/graph/node_attached_data.h",

chrome/browser/performance_manager/persistence/site_data/site_data_store.h

+// Copyright 2018 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_PERFORMANCE_MANAGER_PERSISTENCE_SITE_DATA_SITE_DATA_STORE_H_
+#define CHROME_BROWSER_PERFORMANCE_MANAGER_PERSISTENCE_SITE_DATA_SITE_DATA_STORE_H_
+
+#include <vector>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/optional.h"
+#include "chrome/browser/performance_manager/persistence/site_data/site_data.pb.h"
+#include "url/origin.h"
+
+class SiteDataProto;
+
+namespace performance_manager {
+
+// Interface for an on-disk SiteData store.
+class SiteDataStore {
+ public:
+  // Callback to call once the initialization from the store has completed,
+  // |site_data_proto| should be equal to base::nullopt if the initialization
+  // has failed.
+  using ReadSiteDataFromStoreCallback =
+      base::OnceCallback<void(base::Optional<SiteDataProto> site_data_proto)>;
+  using GetStoreSizeCallback =
+      base::OnceCallback<void(base::Optional<int64_t> num_rows,
+                              base::Optional<int64_t> on_disk_size_kb)>;
+
+  SiteDataStore() = default;
+  virtual ~SiteDataStore() {}
+
+  // Checks the if there's an entry with the key |origin| and if pass the
+  // corresponding proto to |callback|.
+  virtual void ReadSiteDataFromStore(
+      const url::Origin& origin,
+      ReadSiteDataFromStoreCallback callback) = 0;
+
+  // Store an entry in the store, create it if it doesn't exist and update it it
+  // it does.
+  virtual void WriteSiteDataIntoStore(const url::Origin& origin,
+                                      const SiteDataProto& site_data_proto) = 0;
+
+  // Removes some entries from the store.
+  virtual void RemoveSiteDataFromStore(
+      const std::vector<url::Origin>& site_origins) = 0;
+
+  // Clear the store, removes every entries that it contains.
+  virtual void ClearStore() = 0;
+
+  // Retrieve the size of the store.
+  virtual void GetStoreSize(GetStoreSizeCallback callback) = 0;
+};
+
+}  // namespace performance_manager
+
+#endif  // CHROME_BROWSER_PERFORMANCE_MANAGER_PERSISTENCE_SITE_DATA_SITE_DATA_STORE_H_