[webcrypto] Add JWK import for HMAC and AES-CBC key.

content/renderer/webcrypto/webcrypto_impl.h

Index: content/renderer/webcrypto/webcrypto_impl.h
diff --git a/content/renderer/webcrypto/webcrypto_impl.h b/content/renderer/webcrypto/webcrypto_impl.h
index 5979b628c4f27b35eb7f50711dbc166b97715dc6..7cefe41b387b3b8749a4680150a85e3f76204114 100644
--- a/content/renderer/webcrypto/webcrypto_impl.h
+++ b/content/renderer/webcrypto/webcrypto_impl.h
@@ -16,6 +16,7 @@ class CONTENT_EXPORT WebCryptoImpl
     : NON_EXPORTED_BASE(public WebKit::WebCrypto) {
  public:
   WebCryptoImpl();
+  virtual ~WebCryptoImpl();
 
   virtual void encrypt(
       const WebKit::WebCryptoAlgorithm& algorithm,
@@ -62,9 +63,7 @@ class CONTENT_EXPORT WebCryptoImpl
       unsigned data_size,
       WebKit::WebCryptoResult result);
 
-  static void ShrinkBuffer(WebKit::WebArrayBuffer* buffer, unsigned new_size);
   static WebKit::WebCryptoKey NullKey();
-
  protected:
   friend class WebCryptoImplTest;
 
@@ -115,6 +114,14 @@ class CONTENT_EXPORT WebCryptoImpl
       unsigned data_size,
       bool* signature_match);
 
+  bool ImportKeyJwk(
+      const unsigned char* key_data,
+      unsigned key_data_size,
+      const WebKit::WebCryptoAlgorithm& algorithm,
+      bool extractable,
+      WebKit::WebCryptoKeyUsageMask usage_mask,
+      WebKit::WebCryptoKey* key);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(WebCryptoImpl);
 };