Revert of Add SkRacy

tools/tsan.supp

 # Suppressions for Thread Sanitizer
 #
 # CAREFUL!  Comments must go on their own line or your suppressions will silently fail.
 
 # WebP races (harmlessly) choosing function pointers for SIMD versions of some of its functions.
 race:third_party/externals/libwebp
 
 # Poppler races on startup.
 race:libpoppler.so
 # LCMS is used by poppler, and also races.
 race:liblcms2.so
 
 # skia:2459  Seemingly misdiagnosed use-after-free, having something to do with software GL drivers.
 # Having trouble getting this suppression to match.
 # We've tried: race:swrast_dri.so
 #              race:SkGLContextHelper::init
 # Maybe because it's diagnosed as a use-after-free, not as a race?
 race:SkGLContextHelper
 
 # Threadsafe, should be ported to SkLazyPtr.
 race:SkFontHost_FreeType
 race:is_lcd_supported
 
 # Not threadsafe, should be fixed.
 race:RefFCI
 race:SkString
 race:SkPDF
+
+# These race benignly as used by DMQuiltTask: skia:2725.
+# Suppress while I look for a more focused way to silence this.
+race:SkPixelRef::callGenIDChangeListeners
+race:SkPixelRef::needsNewGenID
+
+# SkPathRef caches its bounding box the first time it's needed.
+# This will be fixed naturally once we create (from a single thread) a
+# bounding-box hierarchy for SkRecord-based SkPictures; all bounds will come pre-cached.
+# So just shut this up for now.
+race:SkPathRef::computeBounds
+
+# SkMatrix caches a type mask.  If we race on this, we'll just calculate the same thing a few times.
+race:SkMatrix::getType
+race:SkMatrix::rectStaysRect
+race:SkMatrix::getPerspectiveTypeMaskOnly
+
+# TODO: some sort of SkRacy<T> to handle cases like SkMatrix, SkPathRef, SkPixelRef above?