binding: Replaces DictionaryHelper::get(ScriptValue) with get(Nullable<T>).

third_party/WebKit/Source/bindings/core/v8/DictionaryHelperForBindings.h

Index: third_party/WebKit/Source/bindings/core/v8/DictionaryHelperForBindings.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/DictionaryHelperForBindings.h b/third_party/WebKit/Source/bindings/core/v8/DictionaryHelperForBindings.h
index 6dca1a9d3d792232a34451ec49c2946fe9a0d944..6c9e4426015eccf779c6b7bb685c846522e12c6b 100644
--- a/third_party/WebKit/Source/bindings/core/v8/DictionaryHelperForBindings.h
+++ b/third_party/WebKit/Source/bindings/core/v8/DictionaryHelperForBindings.h
@@ -27,6 +27,7 @@
 #define DictionaryHelperForBindings_h
 
 #include "bindings/core/v8/Dictionary.h"
+#include "bindings/core/v8/Nullable.h"
 #include "bindings/core/v8/V8Binding.h"
 
 namespace blink {
@@ -43,6 +44,28 @@ bool DictionaryHelper::get(const Dictionary& dictionary,
   return true;
 }
 
+template <typename T>
+bool DictionaryHelper::get(const Dictionary& dictionary,
+                           const StringView& key,
+                           Nullable<T>& value) {
+  v8::Local<v8::Value> v8Value;
+  if (!dictionary.get(key, v8Value))
+    return false;
+
+  if (v8Value->IsNull()) {
+    value.set(nullptr);
+    return true;
+  }
+
+  T innerValue;
+  if (DictionaryHelper::get(dictionary, key, innerValue)) {
+    value.set(innerValue);
+    return true;
+  }
+
+  return false;
+}
+
 }  // namespace blink
 
 #endif  // DictionaryHelperForBindings_h