Add StylePath and use it to store 'd' in ComputedStyle
This adds a new class StylePath, that wraps a SVGPathByteStream and a
Path to be used when painting et.c. Create a StylePath on-demand from
CSSPathValue, and then cache the resulting value.
This allows sharing the various levels of path-data between different
instances/elements. It also avoids eagerly constructing the Path object
at setAttribute-time.
To be able to achieve this, SVGPathByteStream is made to be reference-
counted.
BUG=535429
Review URL: https://codereview.chromium.org/1545713003
Cr-Commit-Position: refs/heads/master@{#368320}
21 files changed
