Enable runtime features with status=test before WebKit

content/shell/renderer/layout_test/layout_test_content_renderer_client.cc

Index: content/shell/renderer/layout_test/layout_test_content_renderer_client.cc
diff --git a/content/shell/renderer/layout_test/layout_test_content_renderer_client.cc b/content/shell/renderer/layout_test/layout_test_content_renderer_client.cc
index 3e2cb1ad0bea753cbde6a57b6e5c090259fb9262..ca33cc922d21840d7cbb17fe44cc5f4f4f7778a6 100644
--- a/content/shell/renderer/layout_test/layout_test_content_renderer_client.cc
+++ b/content/shell/renderer/layout_test/layout_test_content_renderer_client.cc
@@ -18,6 +18,7 @@
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_view.h"
 #include "content/public/test/layouttest_support.h"
+#include "content/shell/common/layout_test/layout_test_switches.h"
 #include "content/shell/common/shell_switches.h"
 #include "content/shell/renderer/layout_test/blink_test_helpers.h"
 #include "content/shell/renderer/layout_test/blink_test_runner.h"
@@ -31,6 +32,7 @@
 #include "third_party/WebKit/public/platform/modules/app_banner/WebAppBannerClient.h"
 #include "third_party/WebKit/public/web/WebFrameWidget.h"
 #include "third_party/WebKit/public/web/WebPluginParams.h"
+#include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
 #include "third_party/WebKit/public/web/WebTestingSupport.h"
 #include "third_party/WebKit/public/web/WebView.h"
 #include "ui/gfx/icc_profile.h"
@@ -247,4 +249,11 @@ void LayoutTestContentRendererClient::DidInitializeWorkerContextOnWorkerThread(
   blink::WebTestingSupport::injectInternalsObject(context);
 }
 
+void LayoutTestContentRendererClient::SetRuntimeFeatures() {
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kStableReleaseMode)) {
+    blink::WebRuntimeFeatures::enableTestOnlyFeatures(true);
+  }
+}
+
 }  // namespace content