Apply all blink changes between @202695 and tip of trunk

Source/bindings/core/dart/DartUtilities.cpp

Index: Source/bindings/core/dart/DartUtilities.cpp
diff --git a/Source/bindings/core/dart/DartUtilities.cpp b/Source/bindings/core/dart/DartUtilities.cpp
index 3c9d86e48921eba12d436629d800e18775d8aa2d..2e091a12028b5671876da1b5081816396b316e2f 100644
--- a/Source/bindings/core/dart/DartUtilities.cpp
+++ b/Source/bindings/core/dart/DartUtilities.cpp
@@ -36,6 +36,7 @@
 
 #include "bindings/core/dart/DartController.h"
 #include "bindings/core/dart/DartDOMData.h"
+#include "bindings/core/dart/DartJsInterop.h"
 #include "bindings/core/dart/DartScriptDebugServer.h"
 #include "bindings/core/dart/DartScriptState.h"
 #include "bindings/core/dart/V8Converter.h"
@@ -43,6 +44,7 @@
 #include "bindings/core/v8/ScriptController.h"
 #include "bindings/core/v8/SerializedScriptValueFactory.h"
 #include "bindings/core/v8/V8Binding.h"
+#include "bindings/core/v8/V8Node.h"
 #include "bindings/core/v8/V8PerIsolateData.h"
 #include "core/dom/DOMArrayBuffer.h"
 #include "core/dom/DOMDataView.h"
@@ -565,12 +567,26 @@ Dart_Handle DartUtilities::getDartHtmlType(const char* typeName)
 bool DartUtilities::isNode(Dart_Handle handle)
 {
     Dart_Handle dartType = DartUtilities::getDartHtmlType("Node");
-    return objectIsType(handle, dartType);
+    if (!objectIsType(handle, dartType)) {
+        return false;
+    }
+    // Some dart:html Node instances may not really be Node objects.
+    Dart_Handle exception = 0;
+    v8::Handle<v8::Value> v8Node = JsInterop::fromDart(DartDOMData::current(), handle, exception);
+    if (exception) {
+        return false;
+    }
+    return V8Node::hasInstance(v8Node, v8::Isolate::GetCurrent());
 }
 
-Node* DartUtilities::dartNodeToNativeNode(void* value)
+Node* DartUtilities::dartNodeToNativeNode(Dart_Handle handle)
 {
-    return static_cast<Node*>(value);
+    Dart_Handle exception = 0;
+    v8::Handle<v8::Value> v8Node = JsInterop::fromDart(DartDOMData::current(), handle, exception);
+    ASSERT(!exception);
+    ASSERT(V8Node::hasInstance(v8Node, v8::Isolate::GetCurrent()));
+    Node* node = V8Node::toImpl(v8Node.As<v8::Object>());
+    return node;
 }
 
 bool DartUtilities::isMessagePort(Dart_Handle handle)