--- a/dom/base/nsDOMWindowUtils.cpp
+++ b/dom/base/nsDOMWindowUtils.cpp
@@ -247,16 +247,29 @@ nsDOMWindowUtils::GetLayerTransaction()
     return nullptr;
 
   ShadowLayerForwarder* forwarder = manager->AsShadowForwarder();
   return forwarder && forwarder->HasShadowManager() ?
          forwarder->GetShadowManager() :
          nullptr;
 }
 
+WebRenderBridgeChild*
+nsDOMWindowUtils::GetWebRenderBridge()
+{
+  if (nsIWidget* widget = GetWidget()) {
+    if (LayerManager* lm = widget->GetLayerManager()) {
+      if (WebRenderLayerManager* wrlm = lm->AsWebRenderLayerManager()) {
+        return wrlm->WrBridge();
+      }
+    }
+  }
+  return nullptr;
+}
+
 NS_IMETHODIMP
 nsDOMWindowUtils::GetImageAnimationMode(uint16_t *aMode)
 {
   NS_ENSURE_ARG_POINTER(aMode);
   *aMode = 0;
   nsPresContext* presContext = GetPresContext();
   if (presContext) {
     *aMode = presContext->ImageAnimationMode();
@@ -2503,16 +2516,18 @@ nsDOMWindowUtils::AdvanceTimeAndRefresh(
   nsPresContext* presContext = GetPresContext();
   if (presContext) {
     nsRefreshDriver* driver = presContext->RefreshDriver();
     driver->AdvanceTimeAndRefresh(aMilliseconds);
 
     RefPtr<LayerTransactionChild> transaction = GetLayerTransaction();
     if (transaction && transaction->IPCOpen()) {
       transaction->SendSetTestSampleTime(driver->MostRecentRefresh());
+    } else if (WebRenderBridgeChild* wrbc = GetWebRenderBridge()) {
+      wrbc->SendSetTestSampleTime(driver->MostRecentRefresh());
     }
   }
 
   return NS_OK;
 }
 
 NS_IMETHODIMP
 nsDOMWindowUtils::GetLastTransactionId(uint64_t *aLastTransactionId)
@@ -2531,16 +2546,18 @@ NS_IMETHODIMP
 nsDOMWindowUtils::RestoreNormalRefresh()
 {
   // Kick the compositor out of test mode before the refresh driver, so that
   // the refresh driver doesn't send an update that gets ignored by the
   // compositor.
   RefPtr<LayerTransactionChild> transaction = GetLayerTransaction();
   if (transaction && transaction->IPCOpen()) {
     transaction->SendLeaveTestMode();
+  } else if (WebRenderBridgeChild* wrbc = GetWebRenderBridge()) {
+    wrbc->SendLeaveTestMode();
   }
 
   if (nsPresContext* pc = GetPresContext()) {
     nsRefreshDriver* driver = pc->RefreshDriver();
     driver->RestoreNormalRefresh();
   }
 
   return NS_OK;
@@ -3831,45 +3848,54 @@ nsDOMWindowUtils::GetOMTAStyle(nsIDOMEle
     }
   }
   if (frame && nsLayoutUtils::AreAsyncAnimationsEnabled()) {
     if (aProperty.EqualsLiteral("opacity")) {
       Layer* layer =
         FrameLayerBuilder::GetDedicatedLayer(frame,
                                              nsDisplayItem::TYPE_OPACITY);
       if (layer) {
+        float value = 0;
+        bool hadAnimatedOpacity = false;
         ShadowLayerForwarder* forwarder = layer->Manager()->AsShadowForwarder();
         if (forwarder && forwarder->HasShadowManager()) {
-          float value;
-          bool hadAnimatedOpacity;
           forwarder->GetShadowManager()->
             SendGetAnimationOpacity(layer->GetCompositorAnimationsId(),
                                     &value,
                                     &hadAnimatedOpacity);
 
-          if (hadAnimatedOpacity) {
-            cssValue = new nsROCSSPrimitiveValue;
-            cssValue->SetNumber(value);
-          }
+        } else if (WebRenderLayerManager* wrlm = layer->Manager()->AsWebRenderLayerManager()) {
+          wrlm->WrBridge()->SendGetAnimationOpacity(
+              layer->GetCompositorAnimationsId(),
+              &value,
+              &hadAnimatedOpacity);
+        }
+        if (hadAnimatedOpacity) {
+          cssValue = new nsROCSSPrimitiveValue;
+          cssValue->SetNumber(value);
         }
       }
     } else if (aProperty.EqualsLiteral("transform")) {
       Layer* layer =
         FrameLayerBuilder::GetDedicatedLayer(frame,
                                              nsDisplayItem::TYPE_TRANSFORM);
       if (layer) {
+        MaybeTransform transform;
         ShadowLayerForwarder* forwarder = layer->Manager()->AsShadowForwarder();
         if (forwarder && forwarder->HasShadowManager()) {
-          MaybeTransform transform;
           forwarder->GetShadowManager()->
             SendGetAnimationTransform(layer->GetCompositorAnimationsId(), &transform);
-          if (transform.type() == MaybeTransform::TMatrix4x4) {
-            Matrix4x4 matrix = transform.get_Matrix4x4();
-            cssValue = nsComputedDOMStyle::MatrixToCSSValue(matrix);
-          }
+        } else if (WebRenderLayerManager* wrlm = layer->Manager()->AsWebRenderLayerManager()) {
+          wrlm->WrBridge()->SendGetAnimationTransform(
+              layer->GetCompositorAnimationsId(),
+              &transform);
+        }
+        if (transform.type() == MaybeTransform::TMatrix4x4) {
+          Matrix4x4 matrix = transform.get_Matrix4x4();
+          cssValue = nsComputedDOMStyle::MatrixToCSSValue(matrix);
         }
       }
     }
   }
 
   if (cssValue) {
     nsString text;
     ErrorResult rv;

--- a/dom/base/nsDOMWindowUtils.h
+++ b/dom/base/nsDOMWindowUtils.h
@@ -19,16 +19,17 @@ class nsIWidget;
 class nsPresContext;
 class nsIDocument;
 class nsView;
 struct nsPoint;
 
 namespace mozilla {
   namespace layers {
     class LayerTransactionChild;
+    class WebRenderBridgeChild;
   } // namespace layers
 } // namespace mozilla
 
 class nsTranslationNodeList final : public nsITranslationNodeList
 {
 public:
   nsTranslationNodeList()
   {
@@ -76,16 +77,17 @@ protected:
   // widget returned by GetWidget.
   nsIWidget* GetWidget(nsPoint* aOffset = nullptr);
   nsIWidget* GetWidgetForElement(nsIDOMElement* aElement);
 
   nsIPresShell* GetPresShell();
   nsPresContext* GetPresContext();
   nsIDocument* GetDocument();
   mozilla::layers::LayerTransactionChild* GetLayerTransaction();
+  mozilla::layers::WebRenderBridgeChild* GetWebRenderBridge();
 
   NS_IMETHOD SendMouseEventCommon(const nsAString& aType,
                                   float aX,
                                   float aY,
                                   int32_t aButton,
                                   int32_t aClickCount,
                                   int32_t aModifiers,
                                   bool aIgnoreRootScrollFrame,