Add type-safe constructors to net::HashValue

net/base/hash_value.cc

Index: net/base/hash_value.cc
diff --git a/net/base/hash_value.cc b/net/base/hash_value.cc
index 2a751cd21924e3525259185a3eb51f91443f3aa7..7f2e479e63c38e39638616274b974077b5b5348e 100644
--- a/net/base/hash_value.cc
+++ b/net/base/hash_value.cc
@@ -31,6 +31,15 @@ bool SHA256HashValue::Equals(const SHA256HashValue& other) const {
   return memcmp(data, other.data, sizeof(data)) == 0;
 }
 
+HashValue::HashValue(const SHA1HashValue& hash) : HashValue(HASH_VALUE_SHA1) {
+  fingerprint.sha1 = hash;
+}
+
+HashValue::HashValue(const SHA256HashValue& hash)
+    : HashValue(HASH_VALUE_SHA256) {
+  fingerprint.sha256 = hash;
+}
+
 bool HashValue::Equals(const HashValue& other) const {
   if (tag != other.tag)
     return false;