add studio survey button to header.

adds JS to save in local storage whether the user already clicked the
survey. The button appears only if they have not clicked it yet.

Change-Id: Ifc5a100a8bb8505c47d95c7cfb5aaa8cdbfdc8bd
diff --git a/tools/droiddoc/templates-sdk/assets/js/docs.js b/tools/droiddoc/templates-sdk/assets/js/docs.js
index ee3ebee..d6aa351 100644
--- a/tools/droiddoc/templates-sdk/assets/js/docs.js
+++ b/tools/droiddoc/templates-sdk/assets/js/docs.js
@@ -21,6 +21,8 @@
 
 $(document).ready(function() {
 
+  showStudioSurveyButton();
+
   // show lang dialog if the URL includes /intl/
   //if (location.pathname.substring(0,6) == "/intl/") {
   //  var lang = location.pathname.split('/')[2];
@@ -5375,3 +5377,17 @@
   $(document)
     .on('click.toggle', '[data-toggle="section"]', Toggle.prototype.toggle);
 })(jQuery);
+
+
+var STUDIO_SURVEY_CLICKED = 'studio-survey-20160429-clicked';
+
+function onClickStudioSurvey() {
+  localStorage.setItem(STUDIO_SURVEY_CLICKED, 'true');
+  $("#studio-survey-button").fadeOut();
+}
+
+function showStudioSurveyButton() {
+  if (localStorage.getItem(STUDIO_SURVEY_CLICKED) == null) {
+    $("#studio-survey-button").show();
+  }
+}
\ No newline at end of file
diff --git a/tools/droiddoc/templates-sdk/components/masthead.cs b/tools/droiddoc/templates-sdk/components/masthead.cs
index 04fee65..d27b2fc 100644
--- a/tools/droiddoc/templates-sdk/components/masthead.cs
+++ b/tools/droiddoc/templates-sdk/components/masthead.cs
@@ -86,7 +86,13 @@
           <span class="dac-sprite dac-google-play"></span>
           <span class="dac-visible-desktop-inline">Developer</span>
           Console
-        </a><?cs /if ?>
+        </a>
+        <a class="dac-header-console-btn" id="studio-survey-button"
+          href="http://goo.gl/forms/dOQUuzwBsX"
+          onclick="onClickStudioSurvey()"
+          target="_blank" style="background:#FFE0B2;display:none"
+        >Take a 1 min survey</a>
+        <?cs /if ?>
 
       </div><!-- end header-wrap.wrap -->
     </div><!-- end header -->