Navigation transitions (web to native app): Revert exit transition (Blink side)

Source/core/html/HTMLLinkElement.cpp

Index: Source/core/html/HTMLLinkElement.cpp
diff --git a/Source/core/html/HTMLLinkElement.cpp b/Source/core/html/HTMLLinkElement.cpp
index 93bc16b9007e9dd898acf7c74176ffd66054762e..dbbe2a31f98cda8ec1e973ad9e676a5d9d495d04 100644
--- a/Source/core/html/HTMLLinkElement.cpp
+++ b/Source/core/html/HTMLLinkElement.cpp
@@ -259,6 +259,14 @@ void HTMLLinkElement::enableIfExitTransitionStyle()
     }
 }
 
+void HTMLLinkElement::disableIfExitTransitionStyle()
+{
+    if (m_relAttribute.isTransitionExitingStylesheet()) {
+        if (LinkStyle* link = linkStyle())
+            link->setDisabledState(true);
+    }
+}
+
 Node::InsertionNotificationRequest HTMLLinkElement::insertedInto(ContainerNode* insertionPoint)
 {
     if (insertionPoint->inDocument()) {
@@ -659,7 +667,10 @@ void LinkStyle::setDisabledState(bool disabled)
                 process();
         } else {
             // FIXME: We don't have enough knowledge here to know if we should call addedStyleSheet() or removedStyleSheet().
-            m_owner->document().styleResolverChanged();
+            if (m_owner->relAttribute().isTransitionExitingStylesheet())
+                m_owner->document().styleResolverChanged(AnalyzedStyleUpdate);

[esprehn, 2014/10/15 18:01:26]

Why are transition sheets special? This doesn't seem right.

[Zhen Wang, 2014/10/15 19:50:58]

The default is FullStyleUpdate. We need AnalyzedStyleUpdate here. 

See the demo video in the CL description. I navigate from the page to a native
app and then press the back button to come back. If I don't treat transition
stylesheets specially here, the user interaction will not function properly
after coming back (cannot click to navigate any more.)

This is related to comments in CSSStyleSheet.cpp.

[esprehn, 2014/10/15 20:19:07]

ditto.

[Zhen Wang, 2014/10/15 23:04:41]

ditto

[Zhen Wang, 2014/12/03 17:54:29]

This is fixed by resetIsTransitionDocument now. 

+            else
+                m_owner->document().styleResolverChanged();
         }
     }
 }