[S.P.] Don't draw frames of animated images that are offscreen.

Source/platform/graphics/PaintInvalidationReason.h

Index: Source/platform/graphics/PaintInvalidationReason.h
diff --git a/Source/platform/graphics/PaintInvalidationReason.h b/Source/platform/graphics/PaintInvalidationReason.h
index 17fe1cf2a9c520b126aa950ed60807090ca0705a..8ce442e7511d3a1625c3042ae16d08c9e38ef7d6 100644
--- a/Source/platform/graphics/PaintInvalidationReason.h
+++ b/Source/platform/graphics/PaintInvalidationReason.h
@@ -27,7 +27,11 @@ enum PaintInvalidationReason {
     PaintInvalidationSelection,
     PaintInvalidationLayer,
     PaintInvalidationRendererInsertion,
-    PaintInvalidationRendererRemoval
+    PaintInvalidationRendererRemoval,
+    // PaintInvalidationDelayedFull means that PaintInvalidationFull is needed in order to fully paint
+    // the content, but that painting of the object can be delayed until a future frame.
+    // This can be the case for an object whose content is not visible to the user.
+    PaintInvalidationDelayedFull
 };
 
 PLATFORM_EXPORT const char* paintInvalidationReasonToString(PaintInvalidationReason);