compositor-worker: plumb element id and mutable properties

third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp

Index: third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp b/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
index ff610fc7505eb5cb88eae2596ef7f27a8ba0df42..9d584a4a6caa665d2a41eeffbbe769a7faa1e1e8 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleAdjuster.cpp
@@ -49,6 +49,7 @@
 #include "core/svg/SVGSVGElement.h"
 #include "platform/Length.h"
 #include "platform/transforms/TransformOperations.h"
+#include "public/platform/WebCompositorMutableProperties.h"
 #include "wtf/Assertions.h"
 
 namespace blink {
@@ -181,6 +182,9 @@ void StyleAdjuster::adjustComputedStyle(ComputedStyle& style, const ComputedStyl
         adjustStyleForFirstLetter(style);
     }
 
+    if (element && element->hasCompositorProxy())
+        style.setHasCompositorProxy(true);
+
     // Make sure our z-index value is only applied if the object is positioned.
     if (style.position() == StaticPosition && !parentStyleForcesZIndexToCreateStackingContext(parentStyle))
         style.setHasAutoZIndex();