Enable runtime flags in webkit_unit_tests.

webkit/support/webkit_support.cc

Index: webkit/support/webkit_support.cc
diff --git a/webkit/support/webkit_support.cc b/webkit/support/webkit_support.cc
index bc3264ba5cb42b89c1e13b21565e0c79cb38062b..19ce2784a9f00a0a057f331b1b1cb8af6ecd6eae 100644
--- a/webkit/support/webkit_support.cc
+++ b/webkit/support/webkit_support.cc
@@ -36,6 +36,7 @@
 #include "third_party/WebKit/public/web/WebFileSystemCallbacks.h"
 #include "third_party/WebKit/public/web/WebKit.h"
 #include "third_party/WebKit/public/web/WebPluginParams.h"
+#include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
 #include "third_party/WebKit/public/web/WebView.h"
 #include "third_party/WebKit/public/platform/WebStorageNamespace.h"
 #include "third_party/WebKit/public/platform/WebURLError.h"
@@ -268,6 +269,10 @@ void SetUpTestEnvironmentForUnitTests() {
   const char* kFixedArguments[] = {"DumpRenderTree"};
   CommandLine::Init(arraysize(kFixedArguments), kFixedArguments);
 
+  WebKit::WebRuntimeFeatures::enableStableFeatures(true);
+  WebKit::WebRuntimeFeatures::enableExperimentalFeatures(true);
+  WebKit::WebRuntimeFeatures::enableTestOnlyFeatures(true);
+
   // Explicitly initialize the GURL library before spawning any threads.
   // Otherwise crash may happend when different threads try to create a GURL
   // at same time.