Rename paint data structures

third_party/WebKit/Source/platform/graphics/paint/README.md

 # Platform paint code
 
 This directory contains the implementation of display lists and display
 list-based painting, except for code which requires knowledge of `core/`
 concepts, such as DOM elements and layout objects.
 
 This code is owned by the [paint team][paint-team-site].
 
 Slimming Paint v2 is currently being implemented. Unlike Slimming Paint v1, SPv2
 represents its paint artifact not as a flat display list, but as a list of
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 (see [DisplayItemCacheSkipper](DisplayItemCacheSkipper.h)).
 ***
 
 Generally, clients of this code should use stack-allocated recorder classes to
 emit display items to a `PaintController` (using `GraphicsContext`).
 
 ### Standalone display items
 
 #### [DrawingDisplayItem](DrawingDisplayItem.h)
 
-Holds an `SkPicture` which contains the Skia commands required to draw some atom
-of content.
+Holds a `PaintRecord` which contains the paint operations required to draw some
+atom of content.
 
 #### [ForeignLayerDisplayItem](ForeignLayerDisplayItem.h)
 
 Draws an atom of content, but using a `cc::Layer` produced by some agent outside
 of the normal Blink paint system (for example, a plugin). Since they always map
 to a `cc::Layer`, they are always the only display item in their paint chunk,
 and are ineligible for squashing with other layers.
 
 ### Paired begin/end display items
 
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 visual and transformed rects of display items in the coordinate space of ancestor
 [`PropertyTreeState`](PropertyTreeState.h)s.
 
 The transformed rect of a display item in an ancestor `PropertyTreeState` is
 that rect, multiplied by the transforms between the display item's
 `PropertyTreeState` and the ancestors, then flattened into 2D.
 
 The visual rect of a display item in an ancestor `PropertyTreeState` is the
 intersection of all of the intermediate clips (transformed in to the ancestor
 state), with the display item's transformed rect.