import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1212720 - Part 1: Implement Document.getAnimations(). r=heycam, r=smaug (8c3951b318)
- Bug 1212720 - Part 2: Tests for document.getAnimations. r=heycam (8e6660abe1)
- Bug 1212720 - Part 3: Remove AnimationTimeline.getAnimations. r=heycam, r=smaug (a663e7e79b)
- Bug 1212720 - Part 4: Remove all cancelAllAnimationsOnEnd. It is not needed any more. r=bbirtles (8c9b92f2d4)
- Bug 1218258 - Fix -Wimplicit-fallthrough warnings in toolkit/components/downloads. r=paolo (1962eee4fc)
- Bug 1218258 - Fix -Wshadow warnings in toolkit/components/downloads. r=paolo (6cf1d464bb)
- Bug 1212323: P1. Use a 640x360 SPS to test for HW decoding support. r=cpearce (ed67910d9c)
- Bug 1212323: P2. Have IsVideoAccelerated return a Promise. r=cpearce (824e543945)
- Bug 1240365 - FileReader should use the global scope correctly in ChromeWorkers, r=smaug, r=khuey (bf40380947)
- Bug 1239210 - Don't process WebIDL files when not compiling; r=glandium (5a55f23b2e)

dom/base/nsDocument.cpp

@@ -10,10 +10,12 @@
 
 #include "nsDocument.h"
 #include "nsIDocumentInlines.h"
+#include "mozilla/AnimationComparator.h"
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/AutoRestore.h"
 #include "mozilla/BinarySearch.h"
 #include "mozilla/DebugOnly.h"
+#include "mozilla/EffectSet.h"
 #include "mozilla/IntegerRange.h"
 #include "mozilla/MemoryReporting.h"
 #include "mozilla/Likely.h"
@@ -3156,6 +3158,32 @@ nsDocument::Timeline()
   return mDocumentTimeline;
 }
 
+void
+nsDocument::GetAnimations(nsTArray<RefPtr<Animation>>& aAnimations)
+{
+  FlushPendingNotifications(Flush_Style);
+
+  // Bug 1174575: Until we implement a suitable PseudoElement interface we
+  // don't have anything to return for the |target| attribute of
+  // KeyframeEffect(ReadOnly) objects that refer to pseudo-elements.
+  // Rather than return some half-baked version of these objects (e.g.
+  // we a null effect attribute) we simply don't provide access to animations
+  // whose effect refers to a pseudo-element until we can support them
+  // properly.
+  for (nsIContent* node = nsINode::GetFirstChild();
+       node;
+       node = node->GetNextNode(this)) {
+    if (!node->IsElement()) {
+      continue;
+    }
+
+    node->AsElement()->GetAnimationsUnsorted(aAnimations);
+  }
+
+  // Sort animations by priority
+  aAnimations.Sort(AnimationPtrComparator<RefPtr<Animation>>());
+}
+
 /* Return true if the document is in the focused top-level window, and is an
  * ancestor of the focused DOMWindow. */
 NS_IMETHODIMP