Analysis server format service wiring (and protocol doc update).

pkg/analysis_server/tool/spec/spec_input.html

Index: pkg/analysis_server/tool/spec/spec_input.html
===================================================================
--- pkg/analysis_server/tool/spec/spec_input.html	(revision 42834)
+++ pkg/analysis_server/tool/spec/spec_input.html	(working copy)
@@ -1224,6 +1224,13 @@
           matching the original as possible, but whitespace at the beginning or
           end of the selected region will be ignored.
         </p>
+        <p>
+          If a request is made for a file which does not exist, or
+          which is not currently subject to analysis (e.g. because it
+          is not associated with any analysis root specified to
+          analysis.setAnalysisRoots), an error of type
+          <tt>FORMAT_INVALID_FILE</tt> will be generated.
+        </p>
         <params>
           <field name="file">
             <ref>FilePath</ref>
@@ -2960,6 +2967,13 @@
             </p>
           </value>
           <value>
+            <code>FORMAT_INVALID_FILE</code>
+            <p>
+              An "edit.format" request specified a FilePath
+              which does not match a Dart file in an analysis root.
+            </p>
+          </value>
+          <value>
             <code>GET_ERRORS_INVALID_FILE</code>
             <p>
               An "analysis.getErrors" request specified a FilePath