Bug 1350754 - Add an FFI to check that a given (pseudo-) element has any type of animations or not. r=birtles,heycam

If an element has any type of animations in match_elements(), we need to call
UpdateEffectProperties() to update KeyframeEffectReadOnly::mProperties.

MozReview-Commit-ID: 1CDhwoM2llE

--HG--
extra : rebase_source : f2c476d579019079702b01fec375f75b4594dee9

layout/style/ServoBindings.cpp

@@ -36,6 +36,7 @@
 #include "nsTArray.h"
 
 #include "mozilla/EffectCompositor.h"
+#include "mozilla/EffectSet.h"
 #include "mozilla/EventStates.h"
 #include "mozilla/Keyframe.h"
 #include "mozilla/ServoElementSnapshot.h"
@@ -458,6 +459,21 @@ Gecko_UpdateAnimations(RawGeckoElementBorrowed aElement,
   }
 }
 
+bool
+Gecko_ElementHasAnimations(RawGeckoElementBorrowed aElement,
+                           nsIAtom* aPseudoTagOrNull)
+{
+  MOZ_ASSERT(!aPseudoTagOrNull ||
+             aPseudoTagOrNull == nsCSSPseudoElements::before ||
+             aPseudoTagOrNull == nsCSSPseudoElements::after);
+
+  CSSPseudoElementType pseudoType =
+    nsCSSPseudoElements::GetPseudoType(aPseudoTagOrNull,
+                                       CSSEnabledState::eForAllContent);
+
+  return !!EffectSet::GetEffectSet(aElement, pseudoType);
+}
+
 bool
 Gecko_ElementHasCSSAnimations(RawGeckoElementBorrowed aElement,
                               nsIAtom* aPseudoTagOrNull)

layout/style/ServoBindings.h

@@ -202,6 +202,8 @@ void Gecko_UpdateAnimations(RawGeckoElementBorrowed aElement,
                             nsIAtom* aPseudoTagOrNull,
                             ServoComputedValuesBorrowedOrNull aComputedValues,
                             ServoComputedValuesBorrowedOrNull aParentComputedValues);
+bool Gecko_ElementHasAnimations(RawGeckoElementBorrowed aElement,
+                                nsIAtom* aPseudoTagOrNull);
 bool Gecko_ElementHasCSSAnimations(RawGeckoElementBorrowed aElement,
                                    nsIAtom* aPseudoTagOrNull);