Initial implementation of copy/paste support

pkg/analysis_server/lib/protocol/protocol.dart

Index: pkg/analysis_server/lib/protocol/protocol.dart
diff --git a/pkg/analysis_server/lib/protocol/protocol.dart b/pkg/analysis_server/lib/protocol/protocol.dart
index 0f913f9a3a6248e64641dd08cebd27eb92058770..d9f0f86748f8101652e14b76d1fd83eed0bea8c3 100644
--- a/pkg/analysis_server/lib/protocol/protocol.dart
+++ b/pkg/analysis_server/lib/protocol/protocol.dart
@@ -470,6 +470,16 @@ class Response {
 
   /**
    * Initialize a newly created instance to represent the
+   * GET_IMPORTED_ELEMENTS_INVALID_FILE error condition.
+   */
+  Response.getImportedElementsInvalidFile(Request request)
+      : this(request.id,
+            error: new RequestError(
+                RequestErrorCode.GET_IMPORTED_ELEMENTS_INVALID_FILE,
+                'Error during `analysis.getImportedElements`: invalid file.'));
+
+  /**
+   * Initialize a newly created instance to represent the
    * GET_NAVIGATION_INVALID_FILE error condition.
    */
   Response.getNavigationInvalidFile(Request request)
@@ -489,6 +499,16 @@ class Response {
                 'Error during `analysis.getReachableSources`: invalid file.'));
 
   /**
+   * Initialize a newly created instance to represent the
+   * IMPORT_ELEMENTS_INVALID_FILE error condition.
+   */
+  Response.importElementsInvalidFile(Request request)
+      : this(request.id,
+            error: new RequestError(
+                RequestErrorCode.IMPORT_ELEMENTS_INVALID_FILE,
+                'Error during `edit.importElements`: invalid file.'));
+
+  /**
    * Initialize a newly created instance to represent an error condition caused
    * by an analysis.reanalyze [request] that specifies an analysis root that is
    * not in the current list of analysis roots.