stop dropping AA when rect stays rect
stop dropping AA when rect stays rect

BUG=skia:

Review URL: https://codereview.chromium.org/1295523002

ominux/skia,rubenvb/skia,ominux/skia,google/skia,nvoron23/skia,ominux/skia,aosp-mirror/platform_external_skia,rubenvb/skia,tmpvar/skia.cc,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,shahrzadmn/skia,ominux/skia,nvoron23/skia,Hikari-no-Tenshi/android_external_skia,tmpvar/skia.cc,HalCanary/skia-hc,shahrzadmn/skia,qrealka/skia-hc,google/skia,aosp-mirror/platform_external_skia,ominux/skia,vanish87/skia,rubenvb/skia,qrealka/skia-hc,qrealka/skia-hc,vanish87/skia,shahrzadmn/skia,vanish87/skia,aosp-mirror/platform_external_skia,rubenvb/skia,qrealka/skia-hc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,nvoron23/skia,ominux/skia,rubenvb/skia,google/skia,tmpvar/skia.cc,HalCanary/skia-hc,nvoron23/skia,HalCanary/skia-hc,nvoron23/skia,HalCanary/skia-hc,vanish87/skia,nvoron23/skia,rubenvb/skia,shahrzadmn/skia,tmpvar/skia.cc,google/skia,ominux/skia,tmpvar/skia.cc,google/skia,rubenvb/skia,rubenvb/skia,vanish87/skia,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia,vanish87/skia,shahrzadmn/skia,tmpvar/skia.cc,vanish87/skia,vanish87/skia,qrealka/skia-hc,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,google/skia,Hikari-no-Tenshi/android_external_skia,tmpvar/skia.cc,shahrzadmn/skia,ominux/skia,Hikari-no-Tenshi/android_external_skia,nvoron23/skia,HalCanary/skia-hc,vanish87/skia,Hikari-no-Tenshi/android_external_skia,shahrzadmn/skia,nvoron23/skia,rubenvb/skia,HalCanary/skia-hc,google/skia,shahrzadmn/skia,qrealka/skia-hc,qrealka/skia-hc,tmpvar/skia.cc,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,rubenvb/skia,HalCanary/skia-hc,tmpvar/skia.cc,google/skia,Hikari-no-Tenshi/android_external_skia,nvoron23/skia,google/skia,shahrzadmn/skia,aosp-mirror/platform_external_skia,ominux/skia,qrealka/skia-hc