Give structured information about imports and export in the service's library response.

runtime/observatory/lib/src/elements/library_view.html

 <link rel="import" href="../../../../packages/polymer/polymer.html">
 <link rel="import" href="class_ref.html">
 <link rel="import" href="curly_block.html">
 <link rel="import" href="eval_box.html">
 <link rel="import" href="field_ref.html">
 <link rel="import" href="function_ref.html">
 <link rel="import" href="instance_ref.html">
 <link rel="import" href="observatory_element.html">
 <link rel="import" href="library_ref.html">
 <link rel="import" href="nav_bar.html">
@@ skipping 28 matching lines @@
             <div class="memberName">vm name</div>
             <div class="memberValue">{{ library.vmName }}</div>
           </div>
         </template>
       </div>
     </div>
 
     <hr>
 
     <div class="content">
-      <template if="{{ library.imports.isNotEmpty }}">
-        imports ({{ library.imports.length }})
-        <curly-block expand="{{ library.imports.length <= 8 }}">
+      <template if="{{ library.dependencies.isNotEmpty }}">
+        dependencies ({{ library.dependencies.length }})
+        <curly-block expand="{{ library.dependencies.length <= 8 }}">
           <div class="memberList">
-            <template repeat="{{ imp in library.imports }}">
+            <template repeat="{{ dep in library.dependencies }}">
               <div class="memberItem">
                 <div class="memberValue">
-                  <library-ref ref="{{ imp }}"></library-ref>
+                  <library-ref ref="{{ dep.target }}"></library-ref>
                 </div>
               </div>
             </template>
           </div>
         </curly-block><br>
         <br>
       </template>
 
       <template if="{{ library.scripts.isNotEmpty }}">
         scripts ({{ library.scripts.length }})
@@ skipping 68 matching lines @@
     <hr>
 
     <div class="content">
       <eval-box callback="{{ evaluate }}"></eval-box>
     </div>
     <view-footer></view-footer>
  </template>
 </polymer-element>
 
 <script type="application/dart" src="library_view.dart"></script>