Rework requests in execution domain

pkg/analysis_server/lib/src/generated_protocol.dart

Index: pkg/analysis_server/lib/src/generated_protocol.dart
diff --git a/pkg/analysis_server/lib/src/generated_protocol.dart b/pkg/analysis_server/lib/src/generated_protocol.dart
index a7b579f228e12b63dc2ff185ba512fc3f4fb69aa..2a37fa44cff2201132c8476b4184ae827de635da 100644
--- a/pkg/analysis_server/lib/src/generated_protocol.dart
+++ b/pkg/analysis_server/lib/src/generated_protocol.dart
@@ -4583,7 +4583,8 @@ class EditSortMembersResult implements HasToJson {
  */
 class ExecutionCreateContextParams implements HasToJson {
   /**
-   * The path of the Dart or HTML file that will be launched.
+   * The path of the Dart or HTML file that will be launched, or the path of
+   * the directory containing the file.
    */
   String contextRoot;
 
@@ -9208,6 +9209,7 @@ class RequestError implements HasToJson {
  *   CONTENT_MODIFIED
  *   FORMAT_INVALID_FILE
  *   GET_ERRORS_INVALID_FILE
+ *   INVALID_EXECUTION_CONTEXT
  *   INVALID_OVERLAY_CHANGE
  *   INVALID_PARAMETER
  *   INVALID_REQUEST
@@ -9242,6 +9244,11 @@ class RequestErrorCode implements Enum {
   static const GET_ERRORS_INVALID_FILE = const RequestErrorCode._("GET_ERRORS_INVALID_FILE");
 
   /**
+   * The context root used to create an execution context does not exist.
+   */
+  static const INVALID_EXECUTION_CONTEXT = const RequestErrorCode._("INVALID_EXECUTION_CONTEXT");
+
+  /**
    * An analysis.updateContent request contained a ChangeContentOverlay object
    * which can't be applied, due to an edit having an offset or length that is
    * out of range.
@@ -9318,7 +9325,7 @@ class RequestErrorCode implements Enum {
   /**
    * A list containing all of the enum values that are defined.
    */
-  static const List<RequestErrorCode> VALUES = const <RequestErrorCode>[CONTENT_MODIFIED, FORMAT_INVALID_FILE, GET_ERRORS_INVALID_FILE, INVALID_OVERLAY_CHANGE, INVALID_PARAMETER, INVALID_REQUEST, REFACTORING_REQUEST_CANCELLED, SERVER_ALREADY_STARTED, SERVER_ERROR, SORT_MEMBERS_INVALID_FILE, SORT_MEMBERS_PARSE_ERRORS, UNANALYZED_PRIORITY_FILES, UNKNOWN_REQUEST, UNSUPPORTED_FEATURE];
+  static const List<RequestErrorCode> VALUES = const <RequestErrorCode>[CONTENT_MODIFIED, FORMAT_INVALID_FILE, GET_ERRORS_INVALID_FILE, INVALID_EXECUTION_CONTEXT, INVALID_OVERLAY_CHANGE, INVALID_PARAMETER, INVALID_REQUEST, REFACTORING_REQUEST_CANCELLED, SERVER_ALREADY_STARTED, SERVER_ERROR, SORT_MEMBERS_INVALID_FILE, SORT_MEMBERS_PARSE_ERRORS, UNANALYZED_PRIORITY_FILES, UNKNOWN_REQUEST, UNSUPPORTED_FEATURE];
 
   final String name;
 
@@ -9332,6 +9339,8 @@ class RequestErrorCode implements Enum {
         return FORMAT_INVALID_FILE;
       case "GET_ERRORS_INVALID_FILE":
         return GET_ERRORS_INVALID_FILE;
+      case "INVALID_EXECUTION_CONTEXT":
+        return INVALID_EXECUTION_CONTEXT;
       case "INVALID_OVERLAY_CHANGE":
         return INVALID_OVERLAY_CHANGE;
       case "INVALID_PARAMETER":