Add --stable-release-mode to content_shell

content/shell/app/shell_main_delegate.cc

Index: content/shell/app/shell_main_delegate.cc
diff --git a/content/shell/app/shell_main_delegate.cc b/content/shell/app/shell_main_delegate.cc
index b5adadb176936a9ed68f4746bfc3708ee8ddeae5..d6eecdff63f5e0243e68a1288dffb2fabb70383c 100644
--- a/content/shell/app/shell_main_delegate.cc
+++ b/content/shell/app/shell_main_delegate.cc
@@ -125,8 +125,6 @@ bool ShellMainDelegate::BasicStartupComplete(int* exit_code) {
 #endif
     command_line.AppendSwitch(switches::kSkipGpuDataLoading);
     command_line.AppendSwitch(switches::kDisableGpuVsync);
-    command_line.AppendSwitch(switches::kEnableExperimentalWebPlatformFeatures);
-    command_line.AppendSwitch(switches::kEnableCssShaders);
     command_line.AppendSwitchASCII(switches::kTouchEvents,
                                    switches::kTouchEventsEnabled);
     command_line.AppendSwitch(switches::kEnableGestureTapHighlight);
@@ -139,6 +137,12 @@ bool ShellMainDelegate::BasicStartupComplete(int* exit_code) {
     command_line.AppendSwitch(cc::switches::kDisableImplSidePainting);
 #endif
 
+    if (!command_line.HasSwitch(switches::kStableReleaseMode)) {
+      command_line.AppendSwitch(
+        switches::kEnableExperimentalWebPlatformFeatures);
+      command_line.AppendSwitch(switches::kEnableCssShaders);
+    }
+
     if (!command_line.HasSwitch(switches::kEnableThreadedCompositing))
       command_line.AppendSwitch(cc::switches::kDisableThreadedAnimation);