[webcrypto] Add length parameter to HmacKeyAlgorithm. (blink)

public/platform/WebCryptoKeyAlgorithmParams.h

Index: public/platform/WebCryptoKeyAlgorithmParams.h
diff --git a/public/platform/WebCryptoKeyAlgorithmParams.h b/public/platform/WebCryptoKeyAlgorithmParams.h
index a90fcbecf43e1c1ce61c2cb5f32d32292a99e634..0e96d563dd8bc20169b3bd044390093ea283555b 100644
--- a/public/platform/WebCryptoKeyAlgorithmParams.h
+++ b/public/platform/WebCryptoKeyAlgorithmParams.h
@@ -35,6 +35,9 @@
 #include "WebCryptoAlgorithm.h"
 #include "WebVector.h"
 
+// FIXME: Delete this once the chromium side has picked up the API change.
+#define WEBCRYPTO_HMAC_KEY_HAS_LENGTH 1
+
 namespace blink {
 
 enum WebCryptoKeyAlgorithmParamsType {
@@ -77,8 +80,9 @@ private:
 
 class WebCryptoHmacKeyAlgorithmParams : public WebCryptoKeyAlgorithmParams {
 public:
-    explicit WebCryptoHmacKeyAlgorithmParams(const WebCryptoAlgorithm& hash)
+    WebCryptoHmacKeyAlgorithmParams(const WebCryptoAlgorithm& hash, unsigned lengthBits)
         : m_hash(hash)
+        , m_lengthBits(lengthBits)
     {
     }
 
@@ -87,6 +91,11 @@ public:
         return m_hash;
     }
 
+    unsigned lengthBits() const
+    {
+        return m_lengthBits;
+    }
+
     virtual WebCryptoKeyAlgorithmParamsType type() const
     {
         return WebCryptoKeyAlgorithmParamsTypeHmac;
@@ -94,6 +103,7 @@ public:
 
 private:
     WebCryptoAlgorithm m_hash;
+    unsigned m_lengthBits;
 };
 
 class WebCryptoRsaKeyAlgorithmParams : public WebCryptoKeyAlgorithmParams {