Explore the possibility of implementing the CSS Region interface.

Source/core/inspector/InspectorCSSAgent.cpp

Index: Source/core/inspector/InspectorCSSAgent.cpp
diff --git a/Source/core/inspector/InspectorCSSAgent.cpp b/Source/core/inspector/InspectorCSSAgent.cpp
index 8ae033bb045d2631f530de7126b151370f720eaa..69f5f16d6f398a3f00942f7b224831d2ef688622 100644
--- a/Source/core/inspector/InspectorCSSAgent.cpp
+++ b/Source/core/inspector/InspectorCSSAgent.cpp
@@ -35,6 +35,7 @@
 #include "core/css/CSSImportRule.h"
 #include "core/css/CSSMediaRule.h"
 #include "core/css/CSSParser.h"
+#include "core/css/CSSRegion.h"
 #include "core/css/CSSRule.h"
 #include "core/css/CSSRuleList.h"
 #include "core/css/CSSStyleRule.h"
@@ -1774,14 +1775,14 @@ PassRefPtr<TypeBuilder::CSS::CSSStyle> InspectorCSSAgent::buildObjectForAttribut
     return inspectorStyle->buildObjectForStyle();
 }
 
-PassRefPtr<TypeBuilder::Array<TypeBuilder::CSS::Region> > InspectorCSSAgent::buildArrayForRegions(ErrorString* errorString, PassRefPtr<NodeList> regionList, int documentNodeId)
+PassRefPtr<TypeBuilder::Array<TypeBuilder::CSS::Region> > InspectorCSSAgent::buildArrayForRegions(ErrorString* errorString, Vector<const RenderRegion*> regionList, int documentNodeId)
 {
     RefPtr<TypeBuilder::Array<TypeBuilder::CSS::Region> > regions = TypeBuilder::Array<TypeBuilder::CSS::Region>::create();
 
-    for (unsigned i = 0; i < regionList->length(); ++i) {
+    for (unsigned i = 0; i < regionList.size(); ++i) {
         TypeBuilder::CSS::Region::RegionOverset::Enum regionOverset;
 
-        switch (toElement(regionList->item(i))->renderRegion()->regionOversetState()) {
+        switch (regionList[i]->regionOversetState()) {
         case RegionFit:
             regionOverset = TypeBuilder::CSS::Region::RegionOverset::Fit;
             break;
@@ -1801,7 +1802,7 @@ PassRefPtr<TypeBuilder::Array<TypeBuilder::CSS::Region> > InspectorCSSAgent::bui
         RefPtr<TypeBuilder::CSS::Region> region = TypeBuilder::CSS::Region::create()
             .setRegionOverset(regionOverset)
             // documentNodeId was previously asserted
-            .setNodeId(m_domAgent->pushNodeToFrontend(errorString, documentNodeId, regionList->item(i)));
+            .setNodeId(m_domAgent->pushNodeToFrontend(errorString, documentNodeId, regionList[i]->node()));
 
         regions->addItem(region);
     }