Add correct equality testing for ComputedStyle's StyleVariableData

third_party/WebKit/Source/core/style/StyleVariableData.cpp

Index: third_party/WebKit/Source/core/style/StyleVariableData.cpp
diff --git a/third_party/WebKit/Source/core/style/StyleVariableData.cpp b/third_party/WebKit/Source/core/style/StyleVariableData.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6f01a277e921feb7f033c03aa4dd20ad8ae36f19
--- /dev/null
+++ b/third_party/WebKit/Source/core/style/StyleVariableData.cpp
@@ -0,0 +1,27 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/style/StyleVariableData.h"
+
+#include "core/style/DataEquivalency.h"
+
+namespace blink {
+
+bool StyleVariableData::operator==(const StyleVariableData& other) const
+{
+    if (m_data.size() != other.m_data.size()) {
+        return false;
+    }
+
+    for (const auto& iter : m_data) {
+        RefPtr<CSSVariableData> otherData = other.m_data.get(iter.key);
+        if (!dataEquivalent(iter.value, otherData))
+            return false;
+    }
+
+    return true;
+}
+
+} // namespace blink