Add ResourceType::PING. and mark those requests as detachable.

webkit/common/resource_type.cc

Index: webkit/common/resource_type.cc
diff --git a/webkit/common/resource_type.cc b/webkit/common/resource_type.cc
index 2c416d36b3cecf60f9dcdd3c3688870d3d5e5cb3..26d675b46586b64d913863ef1f784f286ae0bb93 100644
--- a/webkit/common/resource_type.cc
+++ b/webkit/common/resource_type.cc
@@ -40,6 +40,10 @@ ResourceType::Type ResourceType::FromTargetType(
       return ResourceType::FAVICON;
     case WebURLRequest::TargetIsXHR:
       return ResourceType::XHR;
+#if defined(WEBKIT_HAS_TARGET_IS_PING)
+    case WebURLRequest::TargetIsPing:
+      return ResourceType::PING;
+#endif
     default:
       NOTREACHED();
       return ResourceType::SUB_RESOURCE;