Bug 1148949 - Apply async properties when querying the animated transform for cross-process compositor parents too; r=mattwoodrow

Bug 1113425 (specifically, part 2:
https://hg.mozilla.org/mozilla-central/rev/bb3866dea03e) introduced a fix for
a race condition that occurs when querying the animated transform of a layer.
However, that fix failed to update CrossProcessCompositorParent and hence the
issue still arises when e10s is enabled.

This patch applies the fix from that bug to CrossProcessCompositorParent.

gfx/layers/ipc/CompositorParent.cpp

@@ -1648,6 +1648,8 @@ public:
   virtual bool SetTestSampleTime(LayerTransactionParent* aLayerTree,
                                  const TimeStamp& aTime) override;
   virtual void LeaveTestMode(LayerTransactionParent* aLayerTree) override;
+  virtual void ApplyAsyncProperties(LayerTransactionParent* aLayerTree)
+               override;
   virtual void GetAPZTestData(const LayerTransactionParent* aLayerTree,
                               APZTestData* aOutData) override;
   virtual void SetConfirmedTargetAPZC(const LayerTransactionParent* aLayerTree,
@@ -2025,6 +2027,22 @@ CrossProcessCompositorParent::LeaveTestMode(LayerTransactionParent* aLayerTree)
   state->mParent->LeaveTestMode(aLayerTree);
 }
 
+void
+CrossProcessCompositorParent::ApplyAsyncProperties(
+    LayerTransactionParent* aLayerTree)
+{
+  uint64_t id = aLayerTree->GetId();
+  MOZ_ASSERT(id != 0);
+  const CompositorParent::LayerTreeState* state =
+    CompositorParent::GetIndirectShadowTree(id);
+  if (!state) {
+    return;
+  }
+
+  MOZ_ASSERT(state->mParent);
+  state->mParent->ApplyAsyncProperties(aLayerTree);
+}
+
 void
 CrossProcessCompositorParent::GetAPZTestData(const LayerTransactionParent* aLayerTree,
                                              APZTestData* aOutData)

gfx/layers/ipc/ShadowLayersManager.h

@@ -35,7 +35,7 @@ public:
     virtual bool SetTestSampleTime(LayerTransactionParent* aLayerTree,
                                    const TimeStamp& aTime) { return true; }
     virtual void LeaveTestMode(LayerTransactionParent* aLayerTree) { }
-    virtual void ApplyAsyncProperties(LayerTransactionParent* aLayerTree) { }
+    virtual void ApplyAsyncProperties(LayerTransactionParent* aLayerTree) = 0;
     virtual void GetAPZTestData(const LayerTransactionParent* aLayerTree,
                                 APZTestData* aOutData) { }
     virtual void SetConfirmedTargetAPZC(const LayerTransactionParent* aLayerTree,