Issue 4262. Support for --version in dart_analyzer

compiler/java/com/google/dart/compiler/CommandLineOptions.java

Index: compiler/java/com/google/dart/compiler/CommandLineOptions.java
diff --git a/compiler/java/com/google/dart/compiler/CommandLineOptions.java b/compiler/java/com/google/dart/compiler/CommandLineOptions.java
index d73a438e8eb33404fe39deeaeb6c42f6f8de53c2..68a574dc94d9511738b93efc0969e11bcc7c1870 100644
--- a/compiler/java/com/google/dart/compiler/CommandLineOptions.java
+++ b/compiler/java/com/google/dart/compiler/CommandLineOptions.java
@@ -118,6 +118,10 @@ public class CommandLineOptions {
         usage = "For debugging, continue on with resolution even if there are parse errors.")
     private boolean resolveDespiteParseErrors;
 
+    @Option(name = "--version",
+        usage = "Show analyzer version")
+    private boolean showVersion = false;
+
     @Argument
     private final List<String> sourceFiles = new ArrayList<String>();
 
@@ -212,6 +216,10 @@ public class CommandLineOptions {
       return showMetrics;
     }
 
+    public boolean showVersion() {
+      return showVersion;
+    }
+
     /**
      * if <code>true</code>, run the AST back through the DartSourceVisitor to create source
      * from the parsed AST and print to stdout.