Credential Manager: Wire up the client.

Source/platform/exported/WebCredential.cpp

Index: Source/platform/exported/WebCredential.cpp
diff --git a/Source/platform/exported/WebCredential.cpp b/Source/platform/exported/WebCredential.cpp
index db6097c1d75ffb0324ce9f746d39dd0a15dce89d..a8ce261d953371c17db0fdd61d25fef298eac1d2 100644
--- a/Source/platform/exported/WebCredential.cpp
+++ b/Source/platform/exported/WebCredential.cpp
@@ -24,6 +24,17 @@ WebCredential::WebCredential(PlatformCredential* credential)
 {
 }
 
+WebCredential& WebCredential::operator=(PlatformCredential* credential)
+{
+    m_platformCredential = credential;
+    return *this;
+}
+
+WebCredential::operator PlatformCredential*() const
+{
+    return m_platformCredential.get();
+}
+
 void WebCredential::reset()
 {
     m_platformCredential.reset();