[DevTools] Don't load sourcemap for blackboxed scripts

third_party/WebKit/Source/devtools/front_end/bindings/BlackboxManager.js

Index: third_party/WebKit/Source/devtools/front_end/bindings/BlackboxManager.js
diff --git a/third_party/WebKit/Source/devtools/front_end/bindings/BlackboxManager.js b/third_party/WebKit/Source/devtools/front_end/bindings/BlackboxManager.js
index 30741da390ce581c49bc7548cb68b49fe495a148..f05fa536a471d8c0d3cc9a204abcb2997b8bab41 100644
--- a/third_party/WebKit/Source/devtools/front_end/bindings/BlackboxManager.js
+++ b/third_party/WebKit/Source/devtools/front_end/bindings/BlackboxManager.js
@@ -49,7 +49,7 @@ WebInspector.BlackboxManager.prototype = {
     isBlackboxedRawLocation: function(location)
     {
         if (!this._scriptIdToPositions.has(location.scriptId))
-            return false;
+            return this._isBlackboxedScript(location.script());
         var positions = this._scriptIdToPositions.get(location.scriptId);
         var index = positions.lowerBound(location, comparator);
         return !!(index % 2);
@@ -312,6 +312,9 @@ WebInspector.BlackboxManager.prototype = {
             if (success) {
                 this._scriptIdToPositions.set(script.scriptId, positions);
                 this._debuggerWorkspaceBinding.updateLocations(script);
+                var isBlackboxed = positions.length !== 0;
+                if (!isBlackboxed && script.sourceMapURL)
+                    this._debuggerWorkspaceBinding.maybeLoadSourceMap(script);
             } else if (!this._scriptIdToPositions.has(script.scriptId)) {
                 this._scriptIdToPositions.set(script.scriptId, []);
             }