Migrate --expose_core_impl flag from DartRunner to DartCompiler.

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 94c18ea9a0cfb6f9a4bc4a52e8e88898fc6702f8..62976f869f464f377e108bea0f8a7ba5893c2a70 100644
--- a/compiler/java/com/google/dart/compiler/CommandLineOptions.java
+++ b/compiler/java/com/google/dart/compiler/CommandLineOptions.java
@@ -38,6 +38,9 @@ public class CommandLineOptions {
         usage = "Do not generate output, only analyze")
     private boolean checkOnly = false;
 
+    @Option(name = "--expose_core_impl", usage = "Automatic import of dart:coreimpl library")
+    private boolean exposeCoreImpl = false;
+
     @Option(name = "--warn_no_such_type",
         usage = "Treat some type checks as warnings\n instead of fatal errors")
     private boolean shouldWarnOnNoSuchType = false;
@@ -153,6 +156,13 @@ public class CommandLineOptions {
     }
 
     /**
+     * @return <code>true</code> to automatically import dart:coreimpl
+     */
+    public boolean shouldExposeCoreImpl() {
+      return exposeCoreImpl;
+    }
+
+    /**
      * Returns whether the option -generate-documentation is provided.
      */
     public boolean generateDocumentation() {
@@ -301,9 +311,6 @@ public class CommandLineOptions {
     @Option(name = "--compile-only", usage = "Compile but do not execute")
     private boolean compileOnly = false;
 
-    @Option(name = "--expose_core_impl", usage = "Automatic import of dart:coreimpl library")
-    private boolean exposeCoreImpl = false;
-
     @Option(name = "--verbose", usage = "Extra diagnostic output")
     private boolean verbose = false;
 
@@ -322,13 +329,6 @@ public class CommandLineOptions {
     }
 
     /**
-     * @return <code>true</code> to automatically import dart:coreimpl
-     */
-    public boolean shouldExposeCoreImpl() {
-      return exposeCoreImpl;
-    }
-
-    /**
      * Returns <code>true</code> if profiling is enabled.
      */
     @Override