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For PaintRecord backed shaders, the rasterization is done internally in
skia, which means images present in these shaders are not pre-decoded
by compositor's decode cache. This change ensures that we capture these
images during discardable image analysis, and replace them with decoded
images from the compositor's cache.

Replacing of these images requires transforming the PaintRecords in
these shaders to SkPictures with decoded images before executing the op
with the shader.

Bug: 735741, 728359
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ie9314e566eaeb1a393c7490e6309d1315ec3733e
Reviewed-on: https://chromium-review.googlesource.com/673826
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504860}