Bug 1509466 - Make cancelAnimationFrame cancel a pending request fram…

…e callback scheduled in the same frame; r=farre

As per the following change to the HTML spec:

  whatwg/html@86b05f8

when running a requestAnimationFrame callback it should be possible to cancel
another requestAnimationFrame callback scheduled to run in the same frame by
using cancelAnimationFrame.

See issue:

  whatwg/html#4359

Differential Revision: https://phabricator.services.mozilla.com/D20974

UltraBlame original commit: 65c438efa01fc8478aa3d1d69bab22f758038b62

dom/base/Document.cpp

@@ -18137,6 +18137,12 @@ SwapElements
 mFrameRequestCallbacks
 )
 ;
+mCanceledFrameRequestCallbacks
+.
+clear
+(
+)
+;
 mFrameRequestCallbacksScheduled
 =
 false
@@ -43331,6 +43337,47 @@ UpdateFrameRequestCallbackSchedulingState
 )
 ;
 }
+else
+{
+Unused
+<
+<
+mCanceledFrameRequestCallbacks
+.
+put
+(
+aHandle
+)
+;
+}
+}
+bool
+Document
+:
+:
+IsCanceledFrameRequestCallback
+(
+int32_t
+aHandle
+)
+const
+{
+return
+!
+mCanceledFrameRequestCallbacks
+.
+empty
+(
+)
+&
+&
+mCanceledFrameRequestCallbacks
+.
+has
+(
+aHandle
+)
+;
 }
 nsresult
 Document

dom/base/Document.h

@@ -363,6 +363,15 @@ include
 "
 mozilla
 /
+HashTable
+.
+h
+"
+#
+include
+"
+mozilla
+/
 LinkedList
 .
 h
@@ -7853,6 +7862,14 @@ int32_t
 aHandle
 )
 ;
+bool
+IsCanceledFrameRequestCallback
+(
+int32_t
+aHandle
+)
+const
+;
 void
 TakeFrameRequestCallbacks
 (
@@ -12339,6 +12356,12 @@ FrameRequest
 >
 mFrameRequestCallbacks
 ;
+HashSet
+<
+int32_t
+>
+mCanceledFrameRequestCallbacks
+;
 nsIBFCacheEntry
 *
 mBFCacheEntry

layout/base/nsRefreshDriver.cpp

@@ -7201,6 +7201,24 @@ docCallbacks
 mCallbacks
 )
 {
+if
+(
+docCallbacks
+.
+mDocument
+-
+>
+IsCanceledFrameRequestCallback
+(
+callback
+.
+mHandle
+)
+)
+{
+continue
+;
+}
 callback
 .
 mCallback

layout/style/ServoBindings.toml

@@ -1985,6 +1985,49 @@ mozilla
 detail
 :
 :
+HashTable
+"
+#
+<
+-
+We
+should
+be
+able
+to
+remove
+this
+once
+#
+https
+:
+/
+/
+github
+.
+com
+/
+rust
+-
+lang
+/
+rust
+-
+bindgen
+/
+pull
+/
+1515
+#
+is
+available
+"
+mozilla
+:
+:
+detail
+:
+:
 PointerType
 "
 "