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SVGImageForContainer tracks a container zoom factor independently of
the actual container size.  This zoom factor needs to be accounted for
in imageForCurrentFrame() -- otherwise we end up producing an SkImage
with a different size than reported by SVGImageForContainer::size().

The easiest way to accomplish this is to use size() when calling
SVGImage::imageForCurrentFrameForContainer(), instead of the unzoomed
m_containerSize.

BUG=643623
R=fs@opera.com,davve@opera.com

Review-Url: https://codereview.chromium.org/2323853002
Cr-Commit-Position: refs/heads/master@{#417504}