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Pixel moving backdrop filters (eg. blur) could sample from outside an
area that isn't behind the render pass when a render pass is clipped.
This resulted in color bleeding from pixels outside the render pass.
GLRenderer intersects the backdrop filter bounds with the
RenderPass::output_rect. This CL adds similar logic to SkiaRenderer and
intersects the backdrop filter bounds with the RenderPassDrawQuad::rect
which is generally going to be the size as the RenderPass.

Bug: 1162743, 1165868
Change-Id: Ibfcad6f58ada11ace2ce262ce71f3159a4b08f89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611452
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Cr-Commit-Position: refs/heads/master@{#842725}