Video Player: Install the cast API extension if it is not installed.

chrome/browser/chromeos/file_manager/app_installer.h

Index: chrome/browser/chromeos/file_manager/app_installer.h
diff --git a/chrome/browser/chromeos/file_manager/app_installer.h b/chrome/browser/chromeos/file_manager/app_installer.h
index bc16def2dd70030f2549e2b8276d73379415265b..75c407e943f9c64eaad66f02fded1e801c8d22ad 100644
--- a/chrome/browser/chromeos/file_manager/app_installer.h
+++ b/chrome/browser/chromeos/file_manager/app_installer.h
@@ -23,6 +23,7 @@ class AppInstaller : public extensions::WebstoreStandaloneInstaller {
   AppInstaller(content::WebContents* web_contents,
                const std::string& item_id,
                Profile* profile,
+               bool silent_installation,
                const Callback& callback);
 
  protected:
@@ -50,6 +51,7 @@ class AppInstaller : public extensions::WebstoreStandaloneInstaller {
  private:
   class WebContentsObserver;
 
+  bool silent_installation_;
   Callback callback_;
   content::WebContents* web_contents_;
   scoped_ptr<WebContentsObserver> web_contents_observer_;