Bug 1582353 - P1. Add MediaResult serializer. r=mjf

Differential Revision: https://phabricator.services.mozilla.com/D47038

--HG--
extra : moz-landing-system : lando

dom/media/MediaResult.h

@@ -21,6 +21,7 @@ namespace mozilla {
 
 class MediaResult {
  public:
+  MediaResult() : mCode(NS_OK) {}
   MOZ_IMPLICIT MediaResult(nsresult aResult) : mCode(aResult) {}
   MediaResult(nsresult aResult, const nsACString& aMessage)
       : mCode(aResult), mMessage(aMessage) {}

dom/media/ipc/MediaIPCUtils.h

@@ -166,6 +166,31 @@ struct ParamTraits<mozilla::media::TimeInterval> {
   }
 };
 
+template <>
+struct ParamTraits<mozilla::MediaResult> {
+  typedef mozilla::MediaResult paramType;
+
+  static void Write(Message* aMsg, const paramType& aParam) {
+    WriteParam(aMsg, aParam.Code());
+    WriteParam(aMsg, aParam.Message());
+    WriteParam(aMsg, aParam.GPUCrashTimeStamp());
+  }
+
+  static bool Read(const Message* aMsg, PickleIterator* aIter,
+                   paramType* aResult) {
+    nsresult result;
+    nsCString message;
+    mozilla::TimeStamp timeStamp;
+    if (ReadParam(aMsg, aIter, &result) && ReadParam(aMsg, aIter, &message) &&
+        ReadParam(aMsg, aIter, &timeStamp)) {
+      *aResult = paramType(result, std::move(message));
+      aResult->SetGPUCrashTimeStamp(timeStamp);
+      return true;
+    }
+    return false;
+  };
+};
+
 }  // namespace IPC
 
 #endif  // mozilla_dom_media_MediaIPCUtils_h