Implement ShadowRoot.mode

third_party/WebKit/Source/core/dom/shadow/ShadowRoot.h

Index: third_party/WebKit/Source/core/dom/shadow/ShadowRoot.h
diff --git a/third_party/WebKit/Source/core/dom/shadow/ShadowRoot.h b/third_party/WebKit/Source/core/dom/shadow/ShadowRoot.h
index cf17ea363e54f0f07374f9bb32d0c8975b42d9c6..6633d33e9897149fa074453d1b79f473160b7d58 100644
--- a/third_party/WebKit/Source/core/dom/shadow/ShadowRoot.h
+++ b/third_party/WebKit/Source/core/dom/shadow/ShadowRoot.h
@@ -79,6 +79,8 @@ public:
 
     ShadowRoot* olderShadowRootForBindings() const;
 
+    String mode() const { return (type() == ShadowRootType::V0 || type() == ShadowRootType::Open) ? "open" : "closed"; };

[kochi, 2016/03/31 06:19:15]

If type() returns ShadowRootType::UserAgent, this returns "closed" ... is it
okay?
As user agent shadow root is not exposed to web, probably it doesn't break the
web,
but we should be clear about the expectation.

I'd suggest you add another layout test, using window.shadowRoot(element) to get
user-agent shadow root from e.g. <input> element.
(see fast/dom/shadow/shadowroot-type.html for example.)

[yuzuchan, 2016/03/31 07:51:07]

Okay, I added a test case for UA shadow root :)

+
     bool isOpenOrV0() const { return type() == ShadowRootType::V0 || type() == ShadowRootType::Open; }
 
     bool isV1() const { return type() == ShadowRootType::Open || type() == ShadowRootType::Closed; }