[LayoutReloaded] Introduce FormattingState (Block/Inline/etc)

[LayoutReloaded] Introduce FormattingState (Block/Inline/etc)
https://bugs.webkit.org/show_bug.cgi?id=183777

Reviewed by Antti Koivisto.

This is in preparation for moving out states from the formatting contexts.

* LayoutReloaded/FormattingContext/BlockFormatting/BlockFormattingContext.js:
(BlockFormattingContext):
* LayoutReloaded/FormattingContext/FormattingContext.js:
(FormattingContext):
(FormattingContext.prototype.layoutState):
(FormattingContext.prototype.layoutContext):
(FormattingContext.prototype.layout):
* LayoutReloaded/FormattingContext/InlineFormatting/InlineFormattingContext.js:
(InlineFormattingContext):
* LayoutReloaded/FormattingState/BlockFormattingState.js: Copied from Tools/LayoutReloaded/LayoutContext.js.
(BlockFormattingState):
* LayoutReloaded/FormattingState/FormattingState.js: Copied from Tools/LayoutReloaded/LayoutContext.js.
(FormattingState):
(FormattingState.prototype.formattingContext):
(FormattingState.prototype.layoutContext):
(FormattingState.prototype._setFormattingContext):
* LayoutReloaded/FormattingState/InlineFormattingState.js: Copied from Tools/LayoutReloaded/LayoutContext.js.
(InlineFormattingState):
* LayoutReloaded/LayoutContext.js:
(LayoutContext):
(LayoutContext.prototype.layout):
(LayoutContext.prototype._createFormattingState):
(LayoutContext.prototype._createFormattingContext): Deleted.
* LayoutReloaded/LayoutReloaded.xcworkspace/contents.xcworkspacedata:
* LayoutReloaded/test/index.html:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@229746 268f45cc-cd09-0410-ab3c-d52691b4dbfc