Linux: add splash screen

chrome/browser/browser_about_handler.h

Index: chrome/browser/browser_about_handler.h
diff --git a/chrome/browser/browser_about_handler.h b/chrome/browser/browser_about_handler.h
index c90d42df61d9a5c2a9a475d53f54f4f0d738de1d..21ffb27ebf8c695aac3a420aad9868e75ed0d430 100644
--- a/chrome/browser/browser_about_handler.h
+++ b/chrome/browser/browser_about_handler.h
@@ -71,6 +71,9 @@ class BrowserAboutHandler : public WebContents {
   // information about current state.
   static void AboutMemory(AboutSource*, int request_id);
 
+  // This displays the Linux splash screen for development releases.
+  static std::string AboutLinuxSplash();
+
  private:
   ChromeURLDataManager::DataSource* about_source_;
   DISALLOW_COPY_AND_ASSIGN(BrowserAboutHandler);