[compositorworker] compositor proxy mutation updates underlying layers

third_party/WebKit/Source/core/dom/CompositorProxy.h

Index: third_party/WebKit/Source/core/dom/CompositorProxy.h
diff --git a/third_party/WebKit/Source/core/dom/CompositorProxy.h b/third_party/WebKit/Source/core/dom/CompositorProxy.h
index cbbe801a216311fcf0f565a5d4e0e1668f83d87a..cf69322d831aaf858bbe04f8c481da5bab500c0f 100644
--- a/third_party/WebKit/Source/core/dom/CompositorProxy.h
+++ b/third_party/WebKit/Source/core/dom/CompositorProxy.h
@@ -10,6 +10,7 @@
 #include "core/dom/CompositorProxyClient.h"
 #include "core/dom/DOMMatrix.h"
 #include "core/dom/Element.h"
+#include "platform/graphics/CompositorMutableState.h"
 #include "platform/heap/Handle.h"
 #include "wtf/text/WTFString.h"
 
@@ -28,7 +29,6 @@ public:
 
     DEFINE_INLINE_TRACE()
     {
-        visitor->trace(m_transform);
         visitor->trace(m_client);
     }
 
@@ -36,6 +36,7 @@ public:
     uint32_t compositorMutableProperties() const { return m_compositorMutableProperties; }
     bool supports(const String& attribute) const;
 
+    bool initialized() const { return m_connected && m_state.get(); }
     bool connected() const { return m_connected; }
     void disconnect();
 
@@ -49,6 +50,8 @@ public:
     void setScrollTop(double, ExceptionState&);
     void setTransform(DOMMatrix*, ExceptionState&);
 
+    void takeCompositorMutableState(std::unique_ptr<CompositorMutableState>);
+
 protected:
     CompositorProxy(uint64_t elementId, uint32_t compositorMutableProperties);
     CompositorProxy(Element&, const Vector<String>& attributeArray);
@@ -60,15 +63,10 @@ private:
 
     const uint64_t m_elementId = 0;
     const uint32_t m_compositorMutableProperties = 0;
-    uint32_t m_mutatedProperties = 0;
-
-    double m_opacity = 0;
-    double m_scrollLeft = 0;
-    double m_scrollTop = 0;
-    Member<DOMMatrix> m_transform;
 
     bool m_connected = true;
     Member<CompositorProxyClient> m_client;
+    std::unique_ptr<CompositorMutableState> m_state;
 };
 
 } // namespace blink