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

- Bug 1208829 - Use the effective visible region to calculate the intermediate surface size. r=mstange (c3f8290088)
- Bug 1168263 - Annotate layers with a perspective transform. r=mattwoodrow (a79c34590c)
- Bug 1199798 - Use more generic tree traversal algorithms in APZCTreeManager. r=botond (9fede80160)
- Bug 1179287 - Skip TestTiledLayerBuffer due to Linux PGO bustage. CLOSED TREE (c8dc548010)
- Bug 1199798 - Create tests for TreeTraversal.h r=botond Move queue and stack includes outside of mozilla namespace. (37ba7ca2fe)
- Bug 1226920 - Allow calling ForEachNode() with an action returning void r=botond (8368fcecc6)
- Bug 1208829 - static_assert that IntRegionTyped is instantiated with a proper unit type. r=mstange (6acc37e149)
- Bug 1208829 - Add utilities for converting between typed and untyped regions. r=mstange (40402a2f11)
- Bug 1208829 - Rename LayerManagerComposite::ApplyOcclusionCulling to PostProcessLayers, and clean it up a bit. r=mstange (34f0bfe970)
- Bug 1208829 - Recompute visible regions during composition. r=mstange (21304a1854)
- Bug 1220873 - Make Layer::mVisibleRegion a LayerIntRegion. r=botond (5b8c30825e)
- Bug 1168263 - Introduce a helper function IntersectMaybeRects(). r=kats (71f5087b64)
- Bug 1168263 - Propagate the scroll-clip of a descendant of a layer with a perspective transform up to the layer itself. r=kats,mstange (fea1d86d5b)
- Bug 1221694 - Add a basic telemetry probe for checkerboarding. r=botond,vladan (5725e19e0d)
- Bug 1168263 - Simplify GetResultingTransformMatrix calculations to avoid unnecessary origin changes. r=roc (80368ae14f)
- Bug 1127170 - Add TYPE_RENDERS_NO_IMAGES for display item with transform type to bypass invalidation during image decode. r=mattwoodrow (f6a207ee9d)
- Bug 1168263 - Add nsDisplayPerspective and build separate layers for perspective. r=roc (b2b23687fb)
- Bug 1176453 - Do not increment the cluster counter for input elements with label. r=kats (5bc312ca59)
- Bug 1165128 - Enable zoomedview by default. r=mcomella (544b50df8b)
- Bug 1181763 - Allow the target fluffing code to fluff even when directly hitting something clickable. r=roc (6ca7dd6904)
- Bug 1188185 - Zoomed View appears when the two links are the same link. r=kats (813fca7975)
- Bug 1192075 - Change copy in Settings for Zoomed View/ magnifying glass preference. r=mcomella (8430d9a907)
- Bug 1191041 - Increase the likelihood of zoomed view triggering for small elements but decreased the likelihood for large elements. r=kats (eedeb65931)
- Bug 1208370 - Deactivate the size heuristic in cluster detection. r=mcomella (360bca3b20)
- Bug 1171731 - Ignore elements with 0 font size in cluster detection. r=kats (16d602f9d7)
- Bug 1172488 - Small clickable text nodes are wrongly detected in cluster detection process. r=kats (d87c933ae2)
- Bug 1191277 - Ensure that we don't find clusters of clickable elements when there is no possible way for the heuristic to actually target those elements. r=domivinc (50608494f9)
- Bug 1226872 - Remove unnecessary wrapper methods in nsLayoutUtils. r=roc (6fbe70a794)
- Bug 1208023 - Remove unused function. r=botond (c4f79eff8e)
- Bug 1208023 - Ensure the minimum scale is a sane value greater than zero and add a separate flag to track if the default zoom is valid. r=botond (523cd967e2)
- Bug 1225508 - Add a displayport on non-scrollable frames which have a resolution. r=botond (106045f0c9)
- Bug 1201272 - use a SkBlurImageFilter for Skia canvas shadows so we can better control composite operations. r=gwright (bca9f2a21a)
- Bug 998042 - 4-byte align Skia surfaces to interoperate with Cairo r=jrmuizel (5311a66ba1)
- Bug 1083101 - Use win32's CreateEventW instead of CreateEvent to avoid macro name collision (68f94fa48c)
- Bug 1148131 - Enable DrawTargetTiled on Android r=Bas (23f7fbca56)
- Bug 1131264 - Extend the workaround for drawing D2D circles. r=bas (67ce725cfe)
- Bug 1174922 - NativeZip does not null-terminate zip entry comparisons correctly, r=nchen (308848c1ef)
- Bug 1127464 - Assert when we unexpectedly unload libraries on Android r=glandium (d55cda6129)
- Bug 497495 late-breaking followup: s/GetAllocatedSize/GetFrameId/ in documentation, to reflect the same change having happened in code. (no review, comment-only, DONTBUILD) (f3cb3cf27c)
- Bug 1216332 - Remove framearena helpers from abstract frame classes and stop them from being instantiated. r=dbaron (5b30fe7cba)
- Bug 1178382 - Ignore overflow: -moz-hidden-unscrollable on <select size=n> listboxes. r=roc (555b7490c5)
- Bug 1197620 - Part 3: Terminate *all* animations if corresponding element style is changed to display:none. r=bbirtles (1614414c50)

gfx/layers/basic/BasicLayerManager.cpp

@@ -243,7 +243,7 @@ public:
   // Set the opaque rect to match the bounds of the visible region.
   void AnnotateOpaqueRect()
   {
-    const nsIntRegion& visibleRegion = mLayer->GetEffectiveVisibleRegion();
+    const nsIntRegion visibleRegion = mLayer->GetEffectiveVisibleRegion().ToUnknownRegion();
     const IntRect& bounds = visibleRegion.GetBounds();
 
     DrawTarget *dt = mTarget->GetDrawTarget();
@@ -430,7 +430,7 @@ MarkLayersHidden(Layer* aLayer, const IntRect& aClipRect,
       return;
     }
 
-    nsIntRegion region = aLayer->GetEffectiveVisibleRegion();
+    nsIntRegion region = aLayer->GetEffectiveVisibleRegion().ToUnknownRegion();
     IntRect r = region.GetBounds();
     TransformIntRect(r, transform, ToOutsideIntRect);
     r.IntersectRect(r, aDirtyRect);
@@ -918,7 +918,7 @@ BasicLayerManager::FlushGroup(PaintLayerContext& aPaintContext, bool aNeedsClipT
   if (!mTransactionIncomplete) {
     if (aNeedsClipToVisibleRegion) {
       gfxUtils::ClipToRegion(aPaintContext.mTarget,
-                             aPaintContext.mLayer->GetEffectiveVisibleRegion());
+                             aPaintContext.mLayer->GetEffectiveVisibleRegion().ToUnknownRegion());
     }
 
     CompositionOp op = GetEffectiveOperator(aPaintContext.mLayer);
@@ -1030,7 +1030,7 @@ BasicLayerManager::PaintLayer(gfxContext* aTarget,
 
   paintLayerContext.Apply2DTransform();
 
-  const nsIntRegion& visibleRegion = aLayer->GetEffectiveVisibleRegion();
+  const nsIntRegion visibleRegion = aLayer->GetEffectiveVisibleRegion().ToUnknownRegion();
   // If needsGroup is true, we'll clip to the visible region after we've popped the group
   if (needsClipToVisibleRegion && !needsGroup) {
     gfxUtils::ClipToRegion(aTarget, visibleRegion);
@@ -1051,7 +1051,7 @@ BasicLayerManager::PaintLayer(gfxContext* aTarget,
   if (is2D) {
     if (needsGroup) {
       PushedGroup pushedGroup =
-        PushGroupForLayer(aTarget, aLayer, aLayer->GetEffectiveVisibleRegion());
+        PushGroupForLayer(aTarget, aLayer, aLayer->GetEffectiveVisibleRegion().ToUnknownRegion());
       PaintSelfOrChildren(paintLayerContext, pushedGroup.mGroupTarget);
       PopGroupForLayer(pushedGroup);
     } else {