Test images rebaselined to account for the new behavior in skia's
picture-shader when a post-raster sampling is required.

Note on change to cc_unittest:

Several of these tests try to compare output between a direct draw
(RasterExpectedBitmap) and an OOPR draw (Raster), expecting the two
results to be identical.

However, OOP doesn't *always* produce the same Skia calls as direct;
if it sees a picture-shader (PaintShader::MakePaintRecord) it will
convert this to a pre-scaled picture-image-shader, and then draw with
that. This makes it invalid to always require *exact* pixel comparisons,
since it may have sent (slightly) different commands/floats to the GPU.

This CL (with a change to picture-shader's handling of post-raster
sampling) stumbled over such a different (perhaps only on
Nexus5-lollipop). To make the test more robust, those tests now
call set_has_animated_images(true) to force converting kRasterAtScale
to kFixedScale for both direct and oop.

Change-Id: Ic0ce9128c75ea598f593187f3a1b54e2c0c4cd8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2619838Reviewed-by: Vasiliy Telezhnikov <vasilyt@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
Cr-Commit-Position: refs/heads/master@{#844395}