CREDENTIAL: Do type checks for credential constructors.

third_party/WebKit/Source/modules/credentialmanager/PasswordCredential.cpp

Index: third_party/WebKit/Source/modules/credentialmanager/PasswordCredential.cpp
diff --git a/third_party/WebKit/Source/modules/credentialmanager/PasswordCredential.cpp b/third_party/WebKit/Source/modules/credentialmanager/PasswordCredential.cpp
index f539ccb5946f8053136b28c2f50309f45d448938..e174b504a68831f129717eaafeede9eca1c8c1d6 100644
--- a/third_party/WebKit/Source/modules/credentialmanager/PasswordCredential.cpp
+++ b/third_party/WebKit/Source/modules/credentialmanager/PasswordCredential.cpp
@@ -25,9 +25,19 @@ PasswordCredential* PasswordCredential::create(WebPasswordCredential* webPasswor
 
 PasswordCredential* PasswordCredential::create(const PasswordCredentialData& data, ExceptionState& exceptionState)
 {
+    if (data.id().isEmpty()) {
+        exceptionState.throwTypeError("'id' must not be empty.");
+        return nullptr;
+    }
+    if (data.password().isEmpty()) {
+        exceptionState.throwTypeError("'password' must not be empty.");
+        return nullptr;
+    }
+
     KURL iconURL = parseStringAsURL(data.iconURL(), exceptionState);
     if (exceptionState.hadException())
         return nullptr;
+
     return new PasswordCredential(data.id(), data.password(), data.name(), iconURL);
 }