Add additional hints to the analyzer to catch the 'x is double' dart2js bug.

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/context/AnalysisOptionsImpl.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/context/AnalysisOptionsImpl.java
diff --git a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/context/AnalysisOptionsImpl.java b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/context/AnalysisOptionsImpl.java
index fa2f298a63332d69bf2aaf5a792bfcaab12ef362..382336006a9a2dd41ab9a217277a14ce4b3bbb48 100644
--- a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/context/AnalysisOptionsImpl.java
+++ b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/context/AnalysisOptionsImpl.java
@@ -33,12 +33,22 @@ public class AnalysisOptionsImpl implements AnalysisOptions {
   private boolean hint = true;
 
   /**
+   * A flag indicating whether analysis is to generate dart2js related hint results.
+   */
+  private boolean dart2jsHint = true;
+
+  /**
    * Initialize a newly created set of analysis options to have their default values.
    */
   public AnalysisOptionsImpl() {
   }
 
   @Override
+  public boolean getDart2jsHint() {
+    return dart2jsHint;
+  }
+
+  @Override
   public boolean getHint() {
     return hint;
   }
@@ -55,6 +65,15 @@ public class AnalysisOptionsImpl implements AnalysisOptions {
   }
 
   /**
+   * Set whether analysis is to generate dart2js related hint results.
+   * 
+   * @param hint {@code true} if analysis is to generate dart2js related hint results
+   */
+  public void setDart2jsHint(boolean dart2jsHints) {
+    this.dart2jsHint = dart2jsHints;
+  }
+
+  /**
    * Set whether analysis is to generate hint results (e.g. type inference based information and pub
    * best practices).
    *