Propagate gpu debugging flags in guest mode

Guest logins in ChromeOS cause Chrome to restart itself through dbus.
Some debugging flags aren't propagated through the restart -- these
include:
* --disable-gpu-watchdog
* --no-sandbox
* --gpu-startup-dialog
* --renderer-startup-dialog

Add these to the list of propagated flags.

Change-Id: I977eabe322447174ca7281137838012d042bac6f

BUG=
TEST=


Review URL: http://codereview.chromium.org/10228020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@134592 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/login/login_utils.cc

@@ -1046,6 +1046,7 @@ std::string LoginUtilsImpl::GetOffTheRecordCommandLine(
       switches::kDefaultDeviceScaleFactor,
       switches::kDisableAccelerated2dCanvas,
       switches::kDisableAcceleratedPlugins,
+      switches::kDisableGpuWatchdog,
       switches::kDisableLoginAnimations,
       switches::kDisableSeccompSandbox,
       switches::kDisableThreadedAnimation,
@@ -1059,13 +1060,16 @@ std::string LoginUtilsImpl::GetOffTheRecordCommandLine(
       switches::kEnableViewport,
       switches::kDisableThreadedCompositing,
       switches::kForceCompositingMode,
+      switches::kGpuStartupDialog,
       switches::kLoginProfile,
       switches::kScrollPixels,
       switches::kNoFirstRun,
+      switches::kNoSandbox,
       switches::kPpapiFlashArgs,
       switches::kPpapiFlashInProcess,
       switches::kPpapiFlashPath,
       switches::kPpapiFlashVersion,
+      switches::kRendererStartupDialog,
       switches::kFlingTapSuppressMaxDown,
       switches::kFlingTapSuppressMaxGap,
       switches::kTouchDevices,