Move ContentChangeType enum to a separate file, so that WebGLRenderingContextBase.h doesn't need La…

third_party/WebKit/Source/core/layout/ContentChangeType.h

Index: third_party/WebKit/Source/core/layout/ContentChangeType.h
diff --git a/third_party/WebKit/Source/core/layout/ContentChangeType.h b/third_party/WebKit/Source/core/layout/ContentChangeType.h
new file mode 100644
index 0000000000000000000000000000000000000000..dfb7b5254ff9e9b7b07435cd65d136d2c7a56af4
--- /dev/null
+++ b/third_party/WebKit/Source/core/layout/ContentChangeType.h
@@ -0,0 +1,14 @@
+// Copyright 2016 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.
+
+#ifndef ContentChangeType_h
+#define ContentChangeType_h
+
+enum ContentChangeType {
+    ImageChanged,
+    CanvasChanged,
+    CanvasContextChanged
+};
+
+#endif // ContentChangeType_h