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

chrome/browser/ui/app_list/start_page_service.h

Index: chrome/browser/ui/app_list/start_page_service.h
diff --git a/chrome/browser/ui/app_list/start_page_service.h b/chrome/browser/ui/app_list/start_page_service.h
index 84590fbc0f4a10d36fbf1b45d918de077729f17f..7a7872b1c3e8eb3b058eb86c02d9eaeef8b0d563 100644
--- a/chrome/browser/ui/app_list/start_page_service.h
+++ b/chrome/browser/ui/app_list/start_page_service.h
@@ -21,6 +21,7 @@
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
+#include "net/url_request/url_fetcher_delegate.h"
 #include "ui/app_list/speech_ui_model_observer.h"
 
 namespace content {
@@ -33,6 +34,10 @@ namespace extensions {
 class Extension;
 }
 
+namespace net {
+class URLFetcher;
+}
+
 class Profile;
 
 namespace app_list {
@@ -45,6 +50,7 @@ class StartPageObserver;
 // and hosts the start page contents.
 class StartPageService : public KeyedService,
                          public content::WebContentsObserver,
+                         public net::URLFetcherDelegate,
                          public SpeechRecognizerDelegate {
  public:
   typedef std::vector<scoped_refptr<const extensions::Extension> >
@@ -112,6 +118,12 @@ class StartPageService : public KeyedService,
   void LoadContents();
   void UnloadContents();
 
+  // Fetch the Google Doodle JSON data and update the app list start page.
+  void FetchDoodleJson();
+
+  // net::URLFetcherDelegate overrides:
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
+
   // KeyedService overrides:
   void Shutdown() override;
 
@@ -152,6 +164,8 @@ class StartPageService : public KeyedService,
 #endif
   scoped_ptr<NetworkChangeObserver> network_change_observer_;
 
+  scoped_ptr<net::URLFetcher> doodle_fetcher_;
+
   base::WeakPtrFactory<StartPageService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(StartPageService);