GM: showmiplevels handles bitmap memory in a nicer way.
GM: showmiplevels handles bitmap memory in a nicer way.

This is helpful for those canvas implementations that want to copy a
bitmap.

Review URL: https://codereview.chromium.org/935943007

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