Issue #1689 - Part 1: Add pref for DOM Animation timelines API

Default false, no intent to ship for web content. Always enabled for Chrome.

2 files changed, 11 insertions, 0 deletions

diff --git a/dom/base/nsDocument.cpp b/dom/base/nsDocument.cpp
index 0fed2db01a..4d6579a898 100644
--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -2923,6 +2923,15 @@ nsDocument::IsWebAnimationsEnabled(JSContext* /*unused*/, JSObject* /*unused*/)
          Preferences::GetBool("dom.animations-api.core.enabled");
 }
 
+bool
+nsDocument::AreWebAnimationsTimelinesEnabled(JSContext* /*unused*/, JSObject* /*unused*/)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  return nsContentUtils::IsCallerChrome() ||
+         Preferences::GetBool("dom.animations-api.timelines.enabled");
+}
+
 DocumentTimeline*
 nsDocument::Timeline()
 {
diff --git a/dom/base/nsDocument.h b/dom/base/nsDocument.h
index 951ed26169..a1fb04c6b0 100644
--- a/dom/base/nsDocument.h
+++ b/dom/base/nsDocument.h
@@ -433,6 +433,8 @@ public:
 
   static bool IsElementAnimateEnabled(JSContext* aCx, JSObject* aObject);
   static bool IsWebAnimationsEnabled(JSContext* aCx, JSObject* aObject);
+  static bool AreWebAnimationsTimelinesEnabled(JSContext* aCx, JSObject* aObject);
+
   virtual mozilla::dom::DocumentTimeline* Timeline() override;
   virtual void GetAnimations(
       nsTArray<RefPtr<mozilla::dom::Animation>>& aAnimations) override;