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

- Bug 1248105 - Move CSSPseudoElement::GetParentObject out of header, r=boris (b851c3806d)
- Bug 1248581 - Fix build bustage on WakeLock.h and CSSPseudoElement.h. r=khuey (fb47a96889)
- Bug 1249230 - Prepend an extra colon to the pseudo type string. r=birtles (6af63f00de)
- fix build on Mac > 10.5 (1ae9402eaf)
- Bug 1241118 - Add gc = GetGeneralCategory(ch) when sc == MOZ_SCRIPT_COMMON. r=jfkthame (51dfbede47)
- minor crash rep (1e7e5bc97e)
- Bug 1240904 - Remove ParamTraits for NPString and NPVariant. r=bsmedberg (1850d10374)
- bug 1170584 - fix PluginMessageUtils on iOS. r=jimm (c624cbe92d)
- Bug 1170343 - Use release-mode asserts when plugins making NPAPI calls on the wrong thread, r=mccr8 (15c71250f4)
- Bug 1239525 - Make sure async plugin initialization is off if e10s is on. r=aklotz (07e73ce74d)
- Bug 1128454 - When plugin bridging fails, propagate the error back to the content process without aborting tabs. r=billm (e1547c00ab)
- Bug 1222169 - remove unused function from PluginProcessChild.cpp; r=aklotz (11a8fc32e1)
- Bug 1239749 - Remove extra space from PermissionSettings.js debug message. r=gwagner (abe2ac7574)
- Bug 1221104 - Revoke 'midi' permission queries with TypeError. r=baku (cce673498f)
- Bug 1221104 - Throw NS_ERROR_NOT_IMPLEMENTED instead of NS_ERROR_UNEXPECTED for PushPermissionDescriptor.userVisible. r=baku (face32ed7b)
- Bug 1228723 - Avoid a promise worker proxy deadlock caused by synchronous Push callbacks. r=catalinb (bd564a0483)
- Bug 1191931, Part 1 - Use tasks in the Push subscription tests. r=mt (3109fdf2af)
- Bug 1191931, Part 2 - Test resubscribing from a worker. r=m (9527fa2672)
- Bug 1243781 - Push methods called from a worker should reject with a `DOMException`. r=mt (f66818b161)
- Bug 1219064 - Add test for extendable pushsubscriptionchange event. r=mt (12af4b59dd)
- Bug 1176449 - Enter an update here to avoid assertions on startup. r=dbaron (1109cce81d)
- Bug 1239743: Do not allow windows to be resized to sizes above the maximum texture size. We don't know how to draw to these anyway. r=jimm (694dafd544)
- Remove some static_casting in CompositorParent. (bug 1245765 part 5, r=mattwoodrow) (4c7f39b18e)
- Bug 1133615 - Don't assert about the contents of RestyleData::mDescendants when in a full style rebuild. r=dbaron (2b071b90d2)
- Bug 1237902 (part 1) - Remove unneeded gfxContext ops in DrawTableBorderSegment(). r=roc. (8490ab67ca)
- Bug 1237902 (part 2) - Pass a DrawTarget to DrawTableBorderSegment(). r=roc. (c602535af0)
- Bug 1237902 (part 3) - Change the gfxContextMatrixAutoSaveRestore in PaintTableBorderBackground() to an AutoRestoreTransform. r=roc. (0b2412e7d6)
- Bug 1242164 - Remove the implementation of colspan=0 (which is now dead code). r=dbaron (88555a04a4)
- Bug 1235478 - Part 1: Rename eAdjustingTimer to eForceAdjustTimer. r=mchang (113a98fa28)
- Bug 1235478 - Part 2: Don't update mMostRecentRefresh when nsRefreshDriver::ScheduleViewManagerFlush is called. r=mchang (7fd8599b7b)
- Bug 1235478 - Part 3: Make weightmapping-12579.html fuzzy on MacOS 10.10. r=jdaggett (559683f95d)
- Bug 1234049 - Ensure we always invalidate new PresShells that are created for an inactive DocShell upon reactivating them. r=smaug (aeca3e08d9)
- Re-backout c216ff19d690 (bug 1059014 part 3) because the removed code is less dead than it first appears. (2cce434c50)

layout/ipc/RenderFrameParent.cpp

@@ -106,9 +106,8 @@ RenderFrameParent::RenderFrameParent(nsFrameLoader* aFrameLoader,
   mAsyncPanZoomEnabled = lm && lm->AsyncPanZoomEnabled();
 
   // Perhaps the document containing this frame currently has no presentation?
-  if (lm && lm->GetBackendType() == LayersBackend::LAYERS_CLIENT) {
-    *aTextureFactoryIdentifier =
-      static_cast<ClientLayerManager*>(lm.get())->GetTextureFactoryIdentifier();
+  if (lm && lm->AsClientLayerManager()) {
+    *aTextureFactoryIdentifier = lm->AsClientLayerManager()->GetTextureFactoryIdentifier();
   } else {
     *aTextureFactoryIdentifier = TextureFactoryIdentifier();
   }
@@ -119,10 +118,8 @@ RenderFrameParent::RenderFrameParent(nsFrameLoader* aFrameLoader,
     // and we'll keep an indirect reference to that tree.
     browser->Manager()->AsContentParent()->AllocateLayerTreeId(browser, aId);
     mLayersId = *aId;
-    if (lm && lm->GetBackendType() == LayersBackend::LAYERS_CLIENT) {
-      ClientLayerManager *clientManager =
-        static_cast<ClientLayerManager*>(lm.get());
-      clientManager->GetRemoteRenderer()->SendNotifyChildCreated(mLayersId);
+    if (lm && lm->AsClientLayerManager()) {
+      lm->AsClientLayerManager()->GetRemoteRenderer()->SendNotifyChildCreated(mLayersId);
     }
   } else if (XRE_IsContentProcess()) {
     ContentChild::GetSingleton()->SendAllocateLayerTreeId(browser->Manager()->ChildID(), browser->GetTabId(), aId);
@@ -208,10 +205,8 @@ RenderFrameParent::OwnerContentChanged(nsIContent* aContent)
 
   RefPtr<LayerManager> lm = mFrameLoader ? GetFrom(mFrameLoader) : nullptr;
   // Perhaps the document containing this frame currently has no presentation?
-  if (lm && lm->GetBackendType() == LayersBackend::LAYERS_CLIENT) {
-    ClientLayerManager *clientManager =
-      static_cast<ClientLayerManager*>(lm.get());
-    clientManager->GetRemoteRenderer()->SendAdoptChild(mLayersId);
+  if (lm && lm->AsClientLayerManager()) {
+    lm->AsClientLayerManager()->GetRemoteRenderer()->SendAdoptChild(mLayersId);
   }
 }
 
@@ -294,9 +289,8 @@ RenderFrameParent::GetTextureFactoryIdentifier(TextureFactoryIdentifier* aTextur
 {
   RefPtr<LayerManager> lm = mFrameLoader ? GetFrom(mFrameLoader) : nullptr;
   // Perhaps the document containing this frame currently has no presentation?
-  if (lm && lm->GetBackendType() == LayersBackend::LAYERS_CLIENT) {
-    *aTextureFactoryIdentifier =
-      static_cast<ClientLayerManager*>(lm.get())->GetTextureFactoryIdentifier();
+  if (lm && lm->AsClientLayerManager()) {
+    *aTextureFactoryIdentifier = lm->AsClientLayerManager()->GetTextureFactoryIdentifier();
   } else {
     *aTextureFactoryIdentifier = TextureFactoryIdentifier();
   }