compositor-worker: plumb element id and mutable properties

third_party/WebKit/public/platform/WebLayer.h

Index: third_party/WebKit/public/platform/WebLayer.h
diff --git a/third_party/WebKit/public/platform/WebLayer.h b/third_party/WebKit/public/platform/WebLayer.h
index 1e1f1ed4f907ff107ab33a4a3dcfd1f638303095..a0e21b27b97afc4ed9c85eadeeb1d3b8d6999549 100644
--- a/third_party/WebKit/public/platform/WebLayer.h
+++ b/third_party/WebKit/public/platform/WebLayer.h
@@ -247,6 +247,12 @@ public:
 
     // Gets the underlying cc layer.
     virtual const cc::Layer* ccLayer() const = 0;
+
+    virtual void setElementId(uint64_t) = 0;
+    virtual uint64_t elementId() const = 0;
+
+    virtual void setCompositorMutableProperties(uint32_t) = 0;
+    virtual uint32_t compositorMutableProperties() const = 0;
 };
 
 } // namespace blink