Specify mapUri for directories

editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/AnalysisServer.java

Index: editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/AnalysisServer.java
diff --git a/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/AnalysisServer.java b/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/AnalysisServer.java
index fe0c918e773ad121a782943295dad407a1c0d29f..dea6bf7822ddbbb7e060ee67d0ee009fad96e41e 100644
--- a/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/AnalysisServer.java
+++ b/editor/tools/plugins/com.google.dart.server/src/com/google/dart/server/generated/AnalysisServer.java
@@ -360,6 +360,18 @@ public interface AnalysisServer {
    *
    * Exactly one of the file and uri fields must be provided.
    *
+   * If the file field is provided and the value is not the path of a file (either the file does not
+   * exist or the path references something other than a file), then an error of type
+   * MAP_URI_INVALID_FILE will be generated.
+   *
+   * If the uri field is provided and the value is not a valid URI or if the URI references something
+   * that is not a file (either a file that does not exist or something other than a file), then an
+   * error of type MAP_URI_INVALID_URI will be generated.
+   *
+   * If the contextRoot used to create the execution context is not a file (either the file does not
+   * exist or the path references something other than a file), then an error of type
+   * INVALID_EXECUTION_CONTEXT will be generated.
+   *
    * @param id The identifier of the execution context in which the URI is to be mapped.
    * @param file The path of the file to be mapped into a URI.
    * @param uri The URI to be mapped into a file path.