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To generate the bitmap for sprite images the location of the
images cannot be assumed to be (0,0) which is the current
scenario. Instead the source rectangle of the image should be
used for getting the correct bitmap of the image.

In the case of image sprites, a single image object has to
hold the classifications of all the images that it contains.
Having a single DarkModeClassification object will wrongly
give the classification of the first image that is classified
to all the images of the sprite.

So instead use the location of source rect of the image as a
key for a map which stores the classifications.

Bug: None
Change-Id: I52487bb511bd5ed9c847cb381e537610f7a420f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1514437Reviewed-by: Stephen Chenney <schenney@chromium.org>
Reviewed-by: Prashant Nevase <prashant.n@samsung.com>
Commit-Queue: Prashant Nevase <prashant.n@samsung.com>
Cr-Commit-Position: refs/heads/master@{#641702}