kiosk: Retry failed app data fetch.

chrome/browser/extensions/webstore_data_fetcher.h

Index: chrome/browser/extensions/webstore_data_fetcher.h
diff --git a/chrome/browser/extensions/webstore_data_fetcher.h b/chrome/browser/extensions/webstore_data_fetcher.h
index fb8aafdb700fa486d968b31bd075d02f0139f06d..b11ac97515ed749f217fe74253c6201dfb88b4dd 100644
--- a/chrome/browser/extensions/webstore_data_fetcher.h
+++ b/chrome/browser/extensions/webstore_data_fetcher.h
@@ -38,6 +38,10 @@ class WebstoreDataFetcher : public base::SupportsWeakPtr<WebstoreDataFetcher>,
 
   void Start();
 
+  void set_max_auto_retries(int max_retries) {
+    max_auto_retries_ = max_retries;
+  }
+
  private:
   void OnJsonParseSuccess(scoped_ptr<base::Value> parsed_json);
   void OnJsonParseFailure(const std::string& error);
@@ -53,6 +57,10 @@ class WebstoreDataFetcher : public base::SupportsWeakPtr<WebstoreDataFetcher>,
   // For fetching webstore JSON data.
   scoped_ptr<net::URLFetcher> webstore_data_url_fetcher_;
 
+  // Maximum auto retry times on server 5xx error or ERR_NETWORK_CHANGED.
+  // Default is 0 which means to use the URLFetcher default behavior.
+  int max_auto_retries_;
+
   DISALLOW_COPY_AND_ASSIGN(WebstoreDataFetcher);
 };