crypto: Add critpto_api.h and annotate the current exports needed to run

crypto/hmac.h

 // Copyright (c) 2011 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.
 
 // Utility class for calculating the HMAC for a given message. We currently
 // only support SHA1 for the hash algorithm, but this can be extended easily.
 
 #ifndef CRYPTO_HMAC_H_
 #define CRYPTO_HMAC_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_piece.h"
+#include "crypto/crypto_api.h"
 
 namespace crypto {
 
 // Simplify the interface and reduce includes by abstracting out the internals.
 struct HMACPlatformData;
 
-class HMAC {
+class CRYPTO_API HMAC {
  public:
   // The set of supported hash functions. Extend as required.
   enum HashAlgorithm {
     SHA1,
     SHA256,
   };
 
   explicit HMAC(HashAlgorithm hash_alg);
   ~HMAC();
 
@@ skipping 26 matching lines @@
  private:
   HashAlgorithm hash_alg_;
   scoped_ptr<HMACPlatformData> plat_;
 
   DISALLOW_COPY_AND_ASSIGN(HMAC);
 };
 
 }  // namespace crypto
 
 #endif  // CRYPTO_HMAC_H_