Enable browser plugin compositing by default, but add a flag to disable it.

chrome/browser/chromeos/login/chrome_restart_request.cc

Index: chrome/browser/chromeos/login/chrome_restart_request.cc
diff --git a/chrome/browser/chromeos/login/chrome_restart_request.cc b/chrome/browser/chromeos/login/chrome_restart_request.cc
index 531ef29bcd19bb6a1177ed48a3b4232ec31c8b6e..1375a363c60cee686bf9902d9cc2417a5e665466 100644
--- a/chrome/browser/chromeos/login/chrome_restart_request.cc
+++ b/chrome/browser/chromeos/login/chrome_restart_request.cc
@@ -83,7 +83,6 @@ std::string DeriveCommandLine(const GURL& start_url,
       ::switches::kDisableSeccompFilterSandbox,
       ::switches::kDisableSeccompSandbox,
       ::switches::kEnableAcceleratedOverflowScroll,
-      ::switches::kEnableBrowserPluginCompositing,

[piman, 2013/03/07 16:53:59]

We want the disable flag here now.

[alexst (slow to review), 2013/03/07 17:55:50]

Right, thank you.

       ::switches::kEnableCompositingForFixedPosition,
       ::switches::kEnableGestureTapHighlight,
       ::switches::kEnableLogging,
@@ -284,10 +283,6 @@ std::string GetKioskAppCommandLine(const std::string& app_id) {
   app_switches.SetString(::switches::kForceAppMode, std::string());
   app_switches.SetString(::switches::kAppId, app_id);
   app_switches.SetString(::switches::kLoginUser, std::string());
-  // TODO(zelidrag): Move the next switch to /sbin/session_manager_setup.sh
-  // instead once http://crbug.com/179256 is resolved.
-  app_switches.SetString(::switches::kEnableBrowserPluginCompositing,
-                         std::string());
 
   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
   CommandLine new_command_line(browser_command_line.GetProgram());