Add error condition INVALID_OVERLAY_CHANGE to analysis server.

pkg/analysis_server/tool/spec/spec_input.html

Index: pkg/analysis_server/tool/spec/spec_input.html
diff --git a/pkg/analysis_server/tool/spec/spec_input.html b/pkg/analysis_server/tool/spec/spec_input.html
index e4459a31bc214087c3ebb111dd9d732488dc7943..80fc1901a52c8f556a18f00e076538da8ec28f21 100644
--- a/pkg/analysis_server/tool/spec/spec_input.html
+++ b/pkg/analysis_server/tool/spec/spec_input.html
@@ -1638,6 +1638,11 @@
           a file content overlay or that has had its overlay removed via
           <a href="#type_RemoveContentOverlay">RemoveContentOverlay</a>.
         </p>
+        <p>
+          If any of the edits cannot be applied due to its offset or
+          length being out of range, an INVALID_OVERLAY_CHANGE error
+          will be reported.
+        </p>
         <object>
           <field name="type" value="change"><ref>String</ref></field>
           <field name="edits">
@@ -2615,6 +2620,15 @@
             </p>
           </value>
           <value>
+            <code>INVALID_OVERLAY_CHANGE</code>
+            <p>
+              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.
+            </p>
+          </value>
+          <value>
             <code>INVALID_PARAMETER</code>
             <p>
               One of the method parameters was invalid.