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This CL moves RecordJpegImageArea() from JpegImageDecoder to
BitmapImageMetrics to centralize the recording of UMAs for JPEGs and to
be consistent with the color space UMA. The method is renamed to
CountJpegArea() to be consistent with other methods in
BitmapImageMetrics.

Bug: 886914
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Idd0dc443a7e742065a158ee19adeb242479a245f
Reviewed-on: https://chromium-review.googlesource.com/1249399
Commit-Queue: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595680}