SkPDFImage no longer caches a unpremul version of N32 bitmaps.
SkPDFImage no longer caches a unpremul version of N32 bitmaps.

This reduces PDF memory overhead by 30% over all GMs.

This reduces PDF memory overhead by 41% over all SKPs in
chromium-skia-gm/playback_${SKP_VERSION}/skps.

BUG=skia:3030

Review URL: https://codereview.chromium.org/840653002

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