The Dev console could come up broken if debuggerModel is null. Added sentry around addEventListene…

third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js

Index: third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js
diff --git a/third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js b/third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js
index 0c1e97bc00f898363e1425c53b1f717d1156627d..843816b2044ce00649c8e8e613d74eb5afe5a237 100644
--- a/third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js
+++ b/third_party/WebKit/Source/devtools/front_end/console/ConsoleView.js
@@ -294,8 +294,11 @@ WebInspector.ConsoleView.prototype = {
 
         // Start Dart specific code.
         var debuggerModel = WebInspector.DebuggerModel.fromTarget(target);
-        debuggerModel.addEventListener(WebInspector.DebuggerModel.Events.DebuggerPaused, this._debuggerPaused, this);
-        debuggerModel.addEventListener(WebInspector.DebuggerModel.Events.DebuggerResumed, this._debuggerResumed, this);
+        // FIXMEDART(terry): Added sentry for possible debuggerModel being null for Dartium.
+        if (debuggerModel != null) {
+            debuggerModel.addEventListener(WebInspector.DebuggerModel.Events.DebuggerPaused, this._debuggerPaused, this);
+            debuggerModel.addEventListener(WebInspector.DebuggerModel.Events.DebuggerResumed, this._debuggerResumed, this);
+        }
         // End Dart specific code.
 
     },