Bug 1098185 - Initialize some more fields in ShadowLayerForwarder when Valgrind is enabled. r=mattwoodrow.

--HG--
extra : rebase_source : 0063948d7a657421005535c8faad68e69b1a5fcf

gfx/layers/ipc/ShadowLayers.cpp

@@ -610,6 +610,14 @@ ShadowLayerForwarder::EndTransaction(InfallibleTArray<EditReply>* aReplies,
       common.stickyScrollContainerId() = mutant->GetStickyScrollContainerId();
       common.stickyScrollRangeOuter() = mutant->GetStickyScrollRangeOuter();
       common.stickyScrollRangeInner() = mutant->GetStickyScrollRangeInner();
+    } else {
+#ifdef MOZ_VALGRIND
+      // Initialize these so that Valgrind doesn't complain when we send them
+      // to another process.
+      common.stickyScrollContainerId() = 0;
+      common.stickyScrollRangeOuter() = LayerRect();
+      common.stickyScrollRangeInner() = LayerRect();
+#endif
     }
     common.scrollbarTargetContainerId() = mutant->GetScrollbarTargetContainerId();
     common.scrollbarDirection() = mutant->GetScrollbarDirection();