Add an OriginFilterBuilder class for [white|black]listing origins.

chrome/browser/browsing_data/origin_filter_builder.h

Index: chrome/browser/browsing_data/origin_filter_builder.h
diff --git a/chrome/browser/browsing_data/origin_filter_builder.h b/chrome/browser/browsing_data/origin_filter_builder.h
new file mode 100644
index 0000000000000000000000000000000000000000..092ec42b161422ee8c87132d9a155c3d8e2fe4f7
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+++ b/chrome/browser/browsing_data/origin_filter_builder.h
@@ -0,0 +1,70 @@
+// Copyright 2016 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_BROWSING_DATA_ORIGIN_FILTER_BUILDER_H_
+#define CHROME_BROWSER_BROWSING_DATA_ORIGIN_FILTER_BUILDER_H_
+
+#include <ostream>
+#include <set>
+#include <vector>
+
+#include "base/callback.h"
+#include "url/gurl.h"
+#include "url/origin.h"
+
+// A class that constructs URL deletion filters (represented as GURL->bool
+// predicates) that match certain origins.
+class OriginFilterBuilder {
+ public:
+  enum Mode {
+    WHITELIST,
+    BLACKLIST
+  };
+
+  // Constructs a filter with the given |mode| - whitelist or blacklist.
+  explicit OriginFilterBuilder(Mode mode);
+
+  ~OriginFilterBuilder();
+
+  // Adds the |origin| to the (white- or black-) list.
+  void AddOrigin(const url::Origin& origin);
+
+  // Sets the |mode| of the filter.
+  void SetMode(Mode mode);
+
+  // Builds a filter that matches URLs whose origins are in the whitelist,
+  // or aren't in the blacklist.
+  base::Callback<bool(const GURL&)> BuildSameOriginFilter() const;
+
+  // Build a filter that matches URLs whose origins, or origins obtained by
+  // replacing the host with any superdomain, are listed in the whitelist,
+  // or are not listed in the blacklist.
+  base::Callback<bool(const GURL&)> BuildDomainFilter() const;
+
+  // A convenience method to produce an empty blacklist, a filter that matches
+  // everything.
+  static base::Callback<bool(const GURL&)> BuildNoopFilter();
+
+ private:
+  // True if the origin of |url| is in the whitelist, or isn't in the blacklist.
+  // The whitelist or blacklist is represented as |origins| and |mode|.
+  static bool MatchesURL(
+      std::set<url::Origin>* origins, Mode mode, const GURL& url);
+
+  // True if any origin [scheme, host, port], such that |url| has the same
+  // scheme and port, and |url|'s host is the same or a subdomain of that host,
+  // is in the whitelist, or isn't in the blacklist. The whitelist or blacklist
+  // is represented as |origins| and |mode|.
+  static bool MatchesURLWithSubdomains(
+      std::set<url::Origin>* origins, Mode mode, const GURL& url);
+
+  // The list of origins and whether they should be interpreted as a whitelist
+  // or blacklist.
+  std::set<url::Origin> origin_list_;
+  Mode mode_;
+
+  DISALLOW_COPY_AND_ASSIGN(OriginFilterBuilder);
+};
+
+#endif  // CHROME_BROWSER_BROWSING_DATA_ORIGIN_FILTER_BUILDER_H_