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In RoundedImageView, we expect to get the size of the stored image via
GetPreferredSize(). However, RoundedImageView may have its preferred
size. As a result, CalculatePreferredSize() overridden by
RoundedImageView is never called. It makes the area to paint the image
bigger than the size of the image. Meanwhile, the canvas function to
paint the image uses tiling flag as default. It is why a small image
is tiled.

This CL uses GetImageSize() in replace of GetPreferredSize(). The side
effect is handled. Add DCHECK to verify.

Bug: 1139498
Change-Id: Ia03c3366f22c8ce7d2c9326fd1097cab3e4ba563
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2499170
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820972}