Upgrade to barracuda 0.4.0-preview. (#3310)

com.unity.ml-agents/Editor/Unity.ML-Agents.Editor.asmdef

 {
     "name": "Unity.ML-Agents.Editor",
     "references": [
-        "Unity.ML-Agents"
+        "Unity.ML-Agents",
+        "Barracuda"
     ],
     "includePlatforms": [
         "Editor"
     "defineConstraints": [],
     "versionDefines": [],
     "noEngineReferences": false
-}
+}

com.unity.ml-agents/Runtime/Unity.ML-Agents.asmdef

 {
     "name": "Unity.ML-Agents",
-    "references": [],
+    "references": [
+        "Barracuda"
+    ],
-    "overrideReferences": true,
+    "overrideReferences": false,
-        "Barracuda.dll",
-}
+}

com.unity.ml-agents/Tests/Editor/Unity.ML-Agents.Editor.Tests.asmdef

     "name": "Unity.ML-Agents.Editor.Tests",
     "references": [
         "Unity.ML-Agents.Editor",
-        "Unity.ML-Agents"
+        "Unity.ML-Agents",
+        "Barracuda"
     ],
     "optionalUnityReferences": [
         "TestAssemblies"
     "precompiledReferences": [
         "System.IO.Abstractions.dll",
         "System.IO.Abstractions.TestingHelpers.dll",
-        "Google.Protobuf.dll",
-        "Barracuda.dll"
+        "Google.Protobuf.dll"
-}
+}

com.unity.ml-agents/package.json

 	"unity": "2018.4",
 	"description": "Add interactivity to your game with ML-Agents trained using Deep Reinforcement Learning. \n\nFor best results, use this text to summarize: \n\u25AA What the package does \n\u25AA How it can benefit the user \n\nNote: Special formatting characters are supported, including line breaks ('\\n') and bullets ('\\u25AA').",
 	"dependencies": {
-		"com.unity.barracuda": "0.3.2-preview"
+		"com.unity.barracuda": "0.4.0-preview"
 	}
 }

Project/Assets/ML-Agents/Editor/DisableBurstFromMenu.cs

+#if UNITY_CLOUD_BUILD
+using UnityEditor;
+
+public class DisableBurstFromMenu
+{
+    /// This method is needed to disable Burst compilation on windows for our cloudbuild tests.
+    /// Barracuda 0.4.0-preview depends on a version of Burst (1.1.1) which does not allow
+    /// users to disable burst compilation on a per platform basis.  The burst version 1.3.0-preview-1
+    /// allows for cross compilation, but is not released yet.
+    ///
+    /// We will be able to remove this when
+    /// 1. Barracuda updates burst 1.3.0-preview-1 or
+    /// 2. We update our edior version for our tests to 2019.1+
+    public static void DisableBurstCompilation()
+    {
+        EditorApplication.ExecuteMenuItem("Jobs/Burst/Enable Compilation");
+    }
+}
+#endif

Project/Assets/ML-Agents/Editor/DisableBurstFromMenu.cs.meta

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