Handle RTCCertificate::fromPEM returning nullptr, with a unit test.

third_party/WebKit/Source/bindings/modules/v8/ScriptValueSerializerForModules.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "bindings/modules/v8/ScriptValueSerializerForModules.h"
 
 #include "bindings/core/v8/SerializationTag.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/modules/v8/V8CryptoKey.h"
 #include "bindings/modules/v8/V8DOMFileSystem.h"
@@ skipping 394 matching lines @@
     return false;
   String pemCertificate;
   if (!readWebCoreString(&pemCertificate))
     return false;
 
   std::unique_ptr<WebRTCCertificateGenerator> certificateGenerator =
       wrapUnique(Platform::current()->createRTCCertificateGenerator());
 
   std::unique_ptr<WebRTCCertificate> certificate(
       certificateGenerator->fromPEM(pemPrivateKey, pemCertificate));
+  if (!certificate)
+    return false;
   RTCCertificate* jsCertificate = new RTCCertificate(std::move(certificate));
 
   *value =
       toV8(jsCertificate, getScriptState()->context()->Global(), isolate());
   return !value->IsEmpty();
 }
 
 bool SerializedScriptValueReaderForModules::doReadHmacKey(
     WebCryptoKeyAlgorithm& algorithm,
     WebCryptoKeyType& type) {
@@ skipping 231 matching lines @@
     : ScriptValueDeserializer(reader,
                               messagePorts,
                               arrayBufferContents,
                               imageBitmapContents) {}
 
 bool ScriptValueDeserializerForModules::read(v8::Local<v8::Value>* value) {
   return toSerializedScriptValueReaderForModules(reader()).read(value, *this);
 }
 
 }  // namespace blink