Factor painting code out of RenderBox into a new class called BoxPainter.

Source/core/core.gypi

Index: Source/core/core.gypi
diff --git a/Source/core/core.gypi b/Source/core/core.gypi
index 30310db290f46134aa57975fa4cce7f9e499acb2..5b19496553ae08579388ce8eb2f9aec47500a300 100644
--- a/Source/core/core.gypi
+++ b/Source/core/core.gypi
@@ -1478,6 +1478,8 @@
             'page/scrolling/ScrollingConstraints.h',
             'page/scrolling/ScrollingCoordinator.cpp',
             'page/scrolling/ScrollingCoordinator.h',
+            'paint/BoxPainter.cpp',
+            'paint/BoxPainter.h',
             'plugins/DOMMimeType.cpp',
             'plugins/DOMMimeType.h',
             'plugins/DOMMimeTypeArray.cpp',
@@ -1493,6 +1495,8 @@
             'rendering/AbstractInlineTextBox.h',
             'rendering/AutoTableLayout.cpp',
             'rendering/AutoTableLayout.h',
+            'rendering/BoxDecorationData.h',
+            'rendering/BoxDecorationData.cpp',

[Stephen Chennney, 2014/09/09 16:14:37]

I would rather put this in paint now, when you're creating the new files, even
though some code in rendering uses it.

[chrishtr, 2014/09/09 16:55:44]

Done.

             'rendering/BidiRun.h',
             'rendering/BidiRunForLine.cpp',
             'rendering/BidiRunForLine.h',
@@ -1748,6 +1752,8 @@
             'rendering/shapes/ShapeOutsideInfo.h',
             'rendering/style/AppliedTextDecoration.cpp',
             'rendering/style/BasicShapes.cpp',
+            'rendering/style/BorderEdge.h',
+            'rendering/style/BorderEdge.cpp',
             'rendering/style/BorderImageLength.h',
             'rendering/style/BorderImageLengthBox.h',
             'rendering/style/CachedUAStyle.h',