Add a static Google Doodle to the experimental app list start page.

chrome/browser/resources/app_list/start_page.css

Index: chrome/browser/resources/app_list/start_page.css
diff --git a/chrome/browser/resources/app_list/start_page.css b/chrome/browser/resources/app_list/start_page.css
index 2a6049fc99ba770c6cfd1d1fb83a9226d2e38e07..19186d463cf5d1d82a20130014d8668caa58cdf4 100644
--- a/chrome/browser/resources/app_list/start_page.css
+++ b/chrome/browser/resources/app_list/start_page.css
@@ -12,6 +12,11 @@ body {
   width: 100%;
 }
 
+#doodle {
+  display: none;
+  margin: auto;
+}
+
 #logo {
   background-image: -webkit-image-set(
     url(chrome://theme/IDR_LOCAL_NTP_IMAGES_LOGO_PNG) 1x,
@@ -20,3 +25,9 @@ body {
   margin: auto;
   width: 269px;
 }
+
+#logo_container {
+  bottom: 0;
+  position: absolute;
+  width: 100%;
+}