Basic 'Quick Fix' support and one fix as example/test

editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/analysis/index/AnalysisMarkerManager.java

Index: editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/analysis/index/AnalysisMarkerManager.java
diff --git a/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/analysis/index/AnalysisMarkerManager.java b/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/analysis/index/AnalysisMarkerManager.java
index d61178dd70e4008ead314b271560c162039fc92d..333aa868b2de22258524568fa04c107bd0e046b7 100644
--- a/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/analysis/index/AnalysisMarkerManager.java
+++ b/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/analysis/index/AnalysisMarkerManager.java
@@ -86,6 +86,8 @@ class AnalysisMarkerManager implements AnalysisListener {
       int length = error.getLength();
       int lineNumber = error.getLineNumber();
       String errMsg = error.getMessage();
+      String errorCodeString = error.getErrorCode().getClass().getCanonicalName() + "."
+          + error.getErrorCode().toString();
 
       // Remove newlines and indent spaces from the compiler's error messages
 
@@ -101,6 +103,7 @@ class AnalysisMarkerManager implements AnalysisListener {
         marker.setAttribute(IMarker.CHAR_START, offset);
         marker.setAttribute(IMarker.CHAR_END, offset + length);
         marker.setAttribute(IMarker.LINE_NUMBER, lineNumber);
+        marker.setAttribute("errorCode", errorCodeString);
       } catch (CoreException e) {
         DartCore.logError("Failed to create marker for " + res + "\n   at " + offset + " message: "
             + errMsg, e);