Bug 722923. Part 3: Rename UpdateViewsForFrame and document it properly. r=matspal

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extra : rebase_source : cc54527bec2d7d049b1abfb079587c183d35899d
Bug 722923. Part 4: Don't walk continuation chain in SyncViewsAndInvalidateDescendants since DoApplyRenderingChangeToTree already does that. r=matspal

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extra : rebase_source : 76d249a52afdcb999f56da6842cf8c96c9e8088a