Navigation transitions (web to native app): Hide/Show transition elements (Blink side)

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 50bfccb701b158c6c80e287d9936e622c79077fb..5ef85b8c99b269694a820145e9b53603cb2d594f 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -5645,7 +5645,7 @@ void Document::getTransitionElementData(Vector<TransitionElementData>& elementDa
     }
 }
 
-void Document::hideTransitionElements(const AtomicString& cssSelector)
+void Document::updateElementOpacity(const AtomicString& cssSelector, double opacity)
 {
     TrackExceptionState exceptionState;
     RefPtrWillBeRawPtr<StaticElementList> elementList = querySelectorAll(cssSelector, exceptionState);
@@ -5654,11 +5654,21 @@ void Document::hideTransitionElements(const AtomicString& cssSelector)
 
         for (unsigned nodeIndex = 0; nodeIndex < nodeListLength; ++nodeIndex) {
             Element* element = elementList->item(nodeIndex);
-            element->setInlineStyleProperty(CSSPropertyOpacity, 0.0, CSSPrimitiveValue::CSS_NUMBER);
+            element->setInlineStyleProperty(CSSPropertyOpacity, opacity, CSSPrimitiveValue::CSS_NUMBER);
         }
     }
 }
 
+void Document::hideTransitionElements(const AtomicString& cssSelector)
+{
+    updateElementOpacity(cssSelector, 0.0);
+}
+
+void Document::showTransitionElements(const AtomicString& cssSelector)
+{
+    updateElementOpacity(cssSelector, 1.0);
+}
+
 bool Document::hasFocus() const
 {
     Page* page = this->page();