When style changes, set the LayoutObject as a client for all StyleImage loads.

third_party/WebKit/Source/core/style/ComputedStyle.h

Index: third_party/WebKit/Source/core/style/ComputedStyle.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.h b/third_party/WebKit/Source/core/style/ComputedStyle.h
index 728d112e7ea9fb724c88316c23fc6f57c8aaccf1..2dd0f2b73529337b5f664b3a9a9b183989f1a9dc 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.h
@@ -1537,7 +1537,7 @@ public:
     static float initialShapeImageThreshold() { return 0; }
 
     bool hasContent() const { return contentData(); }
-    const ContentData* contentData() const { return rareNonInheritedData->m_content.get(); }
+    ContentData* contentData() const { return rareNonInheritedData->m_content.get(); }
     bool contentDataEquivalent(const ComputedStyle* otherStyle) const { return const_cast<ComputedStyle*>(this)->rareNonInheritedData->contentDataEquivalent(*const_cast<ComputedStyle*>(otherStyle)->rareNonInheritedData); }
     void clearContent();
     void setContent(const String&, bool add = false);