Add outline files for StylePropertyMap.

third_party/WebKit/Source/core/css/cssom/StylePropertyMap.idl

Index: third_party/WebKit/Source/core/css/cssom/StylePropertyMap.idl
diff --git a/third_party/WebKit/Source/core/css/cssom/StylePropertyMap.idl b/third_party/WebKit/Source/core/css/cssom/StylePropertyMap.idl
new file mode 100644
index 0000000000000000000000000000000000000000..ee960f8bc3d4ed22d7ce62f9d811a86ca578d57a
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/cssom/StylePropertyMap.idl
@@ -0,0 +1,17 @@
+// 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.
+
+[
+    RuntimeEnabled=CSSTypedOM,
+    GarbageCollected
+] interface StylePropertyMap {
+    [RaisesException] void append(DOMString property, (StyleValue or sequence<StyleValue> or DOMString) value);
+    [RaisesException, ImplementedAs=remove] void delete(DOMString property);
+    StyleValue? get(DOMString property);
+    sequence<StyleValue> getAll(DOMString property);
+    boolean has(DOMString property);
+    [RaisesException] void set(DOMString property, (StyleValue or sequence<StyleValue> or DOMString) value);
+    iterable<DOMString, (StyleValue or sequence<StyleValue>)>;
+    sequence<DOMString> getProperties();
+};