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..25c19e536b118b99185a5eff56da718d14c74d62 100644
--- a/chrome/browser/resources/app_list/start_page.css
+++ b/chrome/browser/resources/app_list/start_page.css
@@ -12,7 +12,12 @@ body {
   width: 100%;
 }
 
-#logo {
+#doodle {
+  display: none;
+  margin: auto;
+}
+
+#default_logo {
   background-image: -webkit-image-set(
     url(chrome://theme/IDR_LOCAL_NTP_IMAGES_LOGO_PNG) 1x,
     url(chrome://theme/IDR_LOCAL_NTP_IMAGES_LOGO_PNG@2x) 2x);
@@ -20,3 +25,9 @@ body {
   margin: auto;
   width: 269px;
 }
+
+#logo_container {
+  bottom: 0;
+  position: absolute;
+  width: 100%;
+}