Add an integration test for kythe support with bug fixes

pkg/analyzer_plugin/doc/api.html

Index: pkg/analyzer_plugin/doc/api.html
diff --git a/pkg/analyzer_plugin/doc/api.html b/pkg/analyzer_plugin/doc/api.html
index 815f376a7144a3b84beb4f5bf9db6eafcaa50429..cb83db633c960b7ee833663b45b6b695f0770d06 100644
--- a/pkg/analyzer_plugin/doc/api.html
+++ b/pkg/analyzer_plugin/doc/api.html
@@ -1478,29 +1478,27 @@ a:focus, a:hover {
   <dl><dt class="field"><b>source: <a href="#type_KytheVName">KytheVName</a></b></dt><dd>
         
         <p>
-          The ticket of the source node (must not be empty).
+          The ticket of the source node.
         </p>
-      </dd><dt class="field"><b>kind: String</b></dt><dd>
+      </dd><dt class="field"><b>kind: String<span style="color:#999999"> (optional)</span></b></dt><dd>
         
         <p>
-          An edge label (may be empty). The schema defines which labels are
-          meaningful.
+          An edge label. The schema defines which labels are meaningful.
         </p>
-      </dd><dt class="field"><b>target: <a href="#type_KytheVName">KytheVName</a></b></dt><dd>
+      </dd><dt class="field"><b>target: <a href="#type_KytheVName">KytheVName</a><span style="color:#999999"> (optional)</span></b></dt><dd>
         
         <p>
-          The ticket of the target node (may be empty).
+          The ticket of the target node.
         </p>
       </dd><dt class="field"><b>fact: String</b></dt><dd>
         
         <p>
-          A fact label (must not be empty). The schema defines which fact labels
-          are meaningful.
+          A fact label. The schema defines which fact labels are meaningful.
         </p>
-      </dd><dt class="field"><b>value: List&lt;int&gt;</b></dt><dd>
+      </dd><dt class="field"><b>value: List&lt;int&gt;<span style="color:#999999"> (optional)</span></b></dt><dd>
         
         <p>
-          The <tt>String</tt> value of the fact (may be empty).
+          The <tt>String</tt> value of the fact.
         </p>
       </dd></dl></dd><dt class="typeDefinition"><a name="type_KytheVName">KytheVName: object</a></dt><dd>
     <p>