Made ElementRareData store ComputedStyle on LayoutObject if possible.
Made ElementRareData store ComputedStyle on LayoutObject of it's base
class NodeRareDataBase if it has a LayoutObject.
Otherwise it is stored on the ComputedStyle member of ElementRareData.
The reason for this is to make it consistent with storage of
ComputedStyle on Node, which stores a union that can be one of:
1) a ComputedStyle
2) a LayoutObject (ComputedStyle can be stored on this)
3) a NodeRareData (LayoutObject can be stored on this which stores
ComputedStyle or if no LayoutObject ComputedStyle can be stored
directly on ElementRareData)
This patch encapsulates the logic of where to store the ComputedStyle
on the ElementRareData so that it doesn't need to be done at the call
site (e.g. in new method Node::setComputedStyle from
https://codereview.chromium.org/2001453002)
The clearComputedStyle method is special and only clears the
ComputedStyle member as its current use is not intended to clear a
LayoutObject's ComputedStyle.
BUG=595137
Review-Url: https://codereview.chromium.org/2293713002
Cr-Commit-Position: refs/heads/master@{#418453}
6 files changed
