Initial UI for Metrics in Observatory

runtime/bin/vmservice/observatory/lib/src/elements/code_ref.html

Index: runtime/bin/vmservice/observatory/lib/src/elements/code_ref.html
diff --git a/runtime/bin/vmservice/observatory/lib/src/elements/code_ref.html b/runtime/bin/vmservice/observatory/lib/src/elements/code_ref.html
index 717ace271db56f7443453e10b86f5cc2a27e705d..c6e53d563209fb4ae3469243fa4566fde9ef2541 100644
--- a/runtime/bin/vmservice/observatory/lib/src/elements/code_ref.html
+++ b/runtime/bin/vmservice/observatory/lib/src/elements/code_ref.html
@@ -6,10 +6,10 @@
     <link rel="stylesheet" href="css/shared.css">
     <template if="{{ code.isDartCode }}">
         <template if="{{ code.isOptimized }}">
-          <a on-click="{{ goto }}" href="{{ url }}">*{{ name }}</a>
+          <a on-click="{{ goto }}" _href="{{ url }}">*{{ name }}</a>
         </template>
         <template if="{{ !code.isOptimized }}">
-          <a on-click="{{ goto }}" href="{{ url }}">{{ name }}</a>
+          <a on-click="{{ goto }}" _href="{{ url }}">{{ name }}</a>
         </template>
     </template>
     <template if="{{ !code.isDartCode }}">