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Currently, we refresh image animations from their draw() impl.

But the rounded-rect fast path introduced in http://crrev.com/1949253004
draws images via shaders, so it may never call Image::draw() to advance
animations.

Update applyShader() to refresh the animations explicitly, similar to
the draw() case.

BUG=644112

Review-Url: https://codereview.chromium.org/2340683002
Cr-Commit-Position: refs/heads/master@{#418544}