Enable texture table dither in Skia GPU

Bug: chromium:1231699
Bug: b/195281495

Change-Id: Iead4e78170509d1a0c9e9c128212d32b87db6418
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3086141
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Cr-Commit-Position: refs/heads/master@{#912247}

skia/config/SkUserConfig.h

@@ -228,10 +228,6 @@ SK_API void SkDebugf_FileLine(const char* file,
 #define SK_IGNORE_BLURRED_RRECT_OPT
 #define SK_USE_DISCARDABLE_SCALEDIMAGECACHE
 
-// Slight layout tests differences when changing GPU dither from shader
-// calculations to a texture table.
-#define SK_DISABLE_GPU_TABLE_DITHER
-
 #define SK_ATTR_DEPRECATED          SK_NOTHING_ARG1
 #define GR_GL_CUSTOM_SETUP_HEADER   "GrGLConfig_chrome.h"
 

third_party/blink/web_tests/TestExpectations

@@ -7747,6 +7747,8 @@ crbug.com/1228246 http/tests/inspector-protocol/network/webbundle.js [ Crash Fai
 
 # linux_layout_tests_layout_ng_disabled needs its own baselines.
 crbug.com/1231699 [ Linux ] virtual/oopr-canvas2d/fast/canvas/canvas-composite.html [ Failure Pass ]
+crbug.com/1231699 [ Linux ] virtual/oopr-canvas2d/fast/canvas/canvas-text-alignment.html [ Failure Pass ]
+crbug.com/1231699 [ Linux ] virtual/gpu/fast/canvas/canvas-text-alignment.html [ Failure Pass ]
 
 # Other devtools flaky tests outside of http/tests/inspector-protocol/network.
 crbug.com/1228261 http/tests/devtools/console/console-context-selector.js [ Crash Failure Pass Skip Timeout ]