The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/22393627cd746171f238bf3cde20fa15db66997d

commit 22393627cd746171f238bf3cde20fa15db66997d
Author: Xida Chen <xidachen@chromium.org>
Date: Tue Jun 06 00:05:19 2017

Support filter operations in PaintRenderingContext2D

This CL makes PaintRenderingContext2D support filter operations. The infra for
the filter operations is already built in the BaseRenderingContext2D. What we
really need to do is just to expose that in the IDL file. In addition, this CL
adds a layout test to verify the correctness. The layout test is the 
same as the layout test for OffscreenCanvas's filter operations.

Bug:  728600 
Change-Id: I0e8f26bc4afd5e679807dcb527149167535952e4
Reviewed-on: https://chromium-review.googlesource.com/522445
Commit-Queue: Xida Chen <xidachen@chromium.org>
Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#477127}
[add] https://crrev.com/22393627cd746171f238bf3cde20fa15db66997d/third_party/WebKit/LayoutTests/http/tests/csspaint/paint2d-filter-expected.html
[add] https://crrev.com/22393627cd746171f238bf3cde20fa15db66997d/third_party/WebKit/LayoutTests/http/tests/csspaint/paint2d-filter.html
[modify] https://crrev.com/22393627cd746171f238bf3cde20fa15db66997d/third_party/WebKit/LayoutTests/http/tests/worklet/webexposed/global-interface-listing-paint-worklet-expected.txt
[modify] https://crrev.com/22393627cd746171f238bf3cde20fa15db66997d/third_party/WebKit/Source/modules/csspaint/PaintRenderingContext2D.cpp
[modify] https://crrev.com/22393627cd746171f238bf3cde20fa15db66997d/third_party/WebKit/Source/modules/csspaint/PaintRenderingContext2D.h
[modify] https://crrev.com/22393627cd746171f238bf3cde20fa15db66997d/third_party/WebKit/Source/modules/csspaint/PaintRenderingContext2D.idl