Index: third_party/WebKit/Source/core/dom/DocumentVisibilityObserver.h |
diff --git a/third_party/WebKit/Source/core/dom/DocumentVisibilityObserver.h b/third_party/WebKit/Source/core/dom/DocumentVisibilityObserver.h |
index 967de8b2767baa7d291d1f087da699bfd7d7ddc4..ae7efb7d84348d92196ec1e6136fcd3a652241a0 100644 |
--- a/third_party/WebKit/Source/core/dom/DocumentVisibilityObserver.h |
+++ b/third_party/WebKit/Source/core/dom/DocumentVisibilityObserver.h |
@@ -20,6 +20,7 @@ public: |
virtual ~DocumentVisibilityObserver(); |
virtual void didChangeVisibilityState(PageVisibilityState) = 0; |
+ virtual void willDetachDocument() { }; |
Justin Novosad
2016/02/04 21:31:38
You could make this pure virtual ("= 0;" instead o
|
// Classes that inherit Node and DocumentVisibilityObserver must have a |
// virtual override of Node::didMoveToNewDocument that calls |