tweak gm to show fractional offsets
tweak gm to show fractional offsets

BUG=skia:
TBR=

Review URL: https://codereview.chromium.org/728403002

w3nd1go/android_external_skia,TeamTwisted/external_skia,google/skia,TeamExodus/external_skia,AOSP-YU/platform_external_skia,pcwalton/skia,Igalia/skia,Igalia/skia,shahrzadmn/skia,aosp-mirror/platform_external_skia,tmpvar/skia.cc,vanish87/skia,rubenvb/skia,nvoron23/skia,tmpvar/skia.cc,nfxosp/platform_external_skia,chenlian2015/skia_from_google,AOSP-YU/platform_external_skia,w3nd1go/android_external_skia,shahrzadmn/skia,nfxosp/platform_external_skia,timduru/platform-external-skia,AOSP-YU/platform_external_skia,samuelig/skia,BrokenROM/external_skia,aosp-mirror/platform_external_skia,TeamTwisted/external_skia,VRToxin-AOSP/android_external_skia,todotodoo/skia,MonkeyZZZZ/platform_external_skia,w3nd1go/android_external_skia,invisiblek/android_external_skia,YUPlayGodDev/platform_external_skia,VRToxin-AOSP/android_external_skia,AOSPB/external_skia,Hikari-no-Tenshi/android_external_skia,boulzordev/android_external_skia,tmpvar/skia.cc,HalCanary/skia-hc,boulzordev/android_external_skia,geekboxzone/mmallow_external_skia,ominux/skia,nvoron23/skia,MonkeyZZZZ/platform_external_skia,noselhq/skia,shahrzadmn/skia,pcwalton/skia,MarshedOut/android_external_skia,jtg-gg/skia,shahrzadmn/skia,Jichao/skia,todotodoo/skia,MarshedOut/android_external_skia,scroggo/skia,qrealka/skia-hc,noselhq/skia,google/skia,vanish87/skia,Jichao/skia,DiamondLovesYou/skia-sys,chenlian2015/skia_from_google,DiamondLovesYou/skia-sys,nvoron23/skia,nvoron23/skia,AOSPB/external_skia,invisiblek/android_external_skia,google/skia,TeamExodus/external_skia,noselhq/skia,google/skia,qrealka/skia-hc,Hikari-no-Tenshi/android_external_skia,UBERMALLOW/external_skia,pcwalton/skia,google/skia,aosp-mirror/platform_external_skia,TeamTwisted/external_skia,UBERMALLOW/external_skia,MonkeyZZZZ/platform_external_skia,MinimalOS-AOSP/platform_external_skia,google/skia,MinimalOS-AOSP/platform_external_skia,UBERMALLOW/external_skia,Jichao/skia,spezi77/android_external_skia,qrealka/skia-hc,MinimalOS-AOSP/platform_external_skia,Igalia/skia,AOSP-YU/platform_external_skia,Infinitive-OS/platform_external_skia,vanish87/skia,TeamTwisted/external_skia,PAC-ROM/android_external_skia,w3nd1go/android_external_skia,boulzordev/android_external_skia,amyvmiwei/skia,noselhq/skia,Igalia/skia,timduru/platform-external-skia,OneRom/external_skia,YUPlayGodDev/platform_external_skia,DiamondLovesYou/skia-sys,timduru/platform-external-skia,shahrzadmn/skia,YUPlayGodDev/platform_external_skia,scroggo/skia,noselhq/skia,HalCanary/skia-hc,todotodoo/skia,w3nd1go/android_external_skia,aosp-mirror/platform_external_skia,AOSPB/external_skia,timduru/platform-external-skia,chenlian2015/skia_from_google,samuelig/skia,rubenvb/skia,Infinitive-OS/platform_external_skia,amyvmiwei/skia,chenlian2015/skia_from_google,tmpvar/skia.cc,geekboxzone/mmallow_external_skia,TeamExodus/external_skia,nvoron23/skia,PAC-ROM/android_external_skia,BrokenROM/external_skia,MarshedOut/android_external_skia,qrealka/skia-hc,MinimalOS-AOSP/platform_external_skia,geekboxzone/mmallow_external_skia,BrokenROM/external_skia,w3nd1go/android_external_skia,MinimalOS-AOSP/platform_external_skia,scroggo/skia,nvoron23/skia,DiamondLovesYou/skia-sys,AOSPB/external_skia,Jichao/skia,TeamExodus/external_skia,AOSP-YU/platform_external_skia,noselhq/skia,scroggo/skia,MarshedOut/android_external_skia,noselhq/skia,spezi77/android_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,OneRom/external_skia,rubenvb/skia,aosp-mirror/platform_external_skia,invisiblek/android_external_skia,TeamTwisted/external_skia,OneRom/external_skia,TeamExodus/external_skia,vanish87/skia,pcwalton/skia,Hikari-no-Tenshi/android_external_skia,boulzordev/android_external_skia,HalCanary/skia-hc,geekboxzone/mmallow_external_skia,MinimalOS-AOSP/platform_external_skia,MonkeyZZZZ/platform_external_skia,amyvmiwei/skia,invisiblek/android_external_skia,Igalia/skia,VRToxin-AOSP/android_external_skia,scroggo/skia,boulzordev/android_external_skia,timduru/platform-external-skia,rubenvb/skia,PAC-ROM/android_external_skia,AOSPB/external_skia,UBERMALLOW/external_skia,Infinitive-OS/platform_external_skia,MinimalOS-AOSP/platform_external_skia,MonkeyZZZZ/platform_external_skia,AOSP-YU/platform_external_skia,vanish87/skia,spezi77/android_external_skia,Infinitive-OS/platform_external_skia,HalCanary/skia-hc,jtg-gg/skia,shahrzadmn/skia,scroggo/skia,w3nd1go/android_external_skia,todotodoo/skia,VRToxin-AOSP/android_external_skia,nfxosp/platform_external_skia,Jichao/skia,Igalia/skia,nfxosp/platform_external_skia,chenlian2015/skia_from_google,timduru/platform-external-skia,Jichao/skia,jtg-gg/skia,tmpvar/skia.cc,aosp-mirror/platform_external_skia,BrokenROM/external_skia,Jichao/skia,AOSPB/external_skia,samuelig/skia,timduru/platform-external-skia,VRToxin-AOSP/android_external_skia,TeamExodus/external_skia,samuelig/skia,qrealka/skia-hc,boulzordev/android_external_skia,HalCanary/skia-hc,boulzordev/android_external_skia,UBERMALLOW/external_skia,YUPlayGodDev/platform_external_skia,AOSP-YU/platf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