Make TrustStore into an interface, move impl to TrustStoreInMemory.

net/cert/internal/trust_store_in_memory.h

+// 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 NET_CERT_INTERNAL_TRUST_STORE_IN_MEMORY_H_
+#define NET_CERT_INTERNAL_TRUST_STORE_IN_MEMORY_H_
+
+#include <unordered_map>
+
+#include "base/memory/ref_counted.h"
+#include "base/strings/string_piece.h"
+#include "net/base/net_export.h"
+#include "net/cert/internal/trust_store.h"
+
+namespace net {
+
+namespace der {
+class Input;
+}
+
+// A very simple implementation of a TrustStore, which contains a set of
+// trust anchors.
+class NET_EXPORT TrustStoreInMemory : public TrustStore {
+ public:
+  TrustStoreInMemory();
+  ~TrustStoreInMemory() override;
+
+  // Empties the trust store, resetting it to original state.
+  void Clear();
+
+  void AddTrustAnchor(scoped_refptr<TrustAnchor> anchor);
+
+  // Returns the trust anchors that match |name| in |*matches|, if any.
+  void FindTrustAnchorsByNormalizedName(const der::Input& normalized_name,
+                                        TrustAnchors* matches) const override;
+
+ private:
+  // Multimap from normalized subject -> TrustAnchor.
+  std::unordered_multimap<base::StringPiece,
+                          scoped_refptr<TrustAnchor>,
+                          base::StringPieceHash>
+      anchors_;
+
+  DISALLOW_COPY_AND_ASSIGN(TrustStoreInMemory);
+};
+
+}  // namespace net
+
+#endif  // NET_CERT_INTERNAL_TRUST_STORE_IN_MEMORY_H_