[Line Layout API] Add shim for Paint objects to access underlying LayoutObject

Source/core/paint/LineLayoutPaintShim.h

Index: Source/core/paint/LineLayoutPaintShim.h
diff --git a/Source/core/paint/LineLayoutPaintShim.h b/Source/core/paint/LineLayoutPaintShim.h
new file mode 100644
index 0000000000000000000000000000000000000000..63ba331d8cb1764f5ca592712353edf0c27ce2ca
--- /dev/null
+++ b/Source/core/paint/LineLayoutPaintShim.h
@@ -0,0 +1,25 @@
+// 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.
+
+#ifndef LineLayoutPaintShim_h
+#define LineLayoutPaintShim_h
+
+#include "core/layout/api/LineLayoutItem.h"
+
+namespace blink {
+
+class LayoutObject;
+
+// TODO(pilgrim): Remove this kludge once Paint objects have a real API and no longer need access to the underlying LayoutObject.

[pdr., 2015/08/26 21:32:18]

I don't want to derail this patch but this line is curious to me.

Where can I find out more about the paint api that doesn't access LayoutObjects?

+class LineLayoutPaintShim {
+public:
+    static LayoutObject* layoutObjectFrom(LineLayoutItem item)
+    {
+        return item.layoutObject();
+    }
+};
+
+} // namespace blink
+
+#endif // LineLayoutPaintShim_h