add gm for 2-rects and blur
add gm for 2-rects and blur

BUG=skia:
TBR=

Review URL: https://codereview.chromium.org/728863002

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