Revert "Use draw buffer for texture copy impl."
Revert "Use draw buffer for texture copy impl."

This reverts commit e3d4bf234a04e14b6b0f33e11b3e1132b560c145.

Conflicts:
	src/gpu/GrContext.cpp

DARKPOP/external_chromium_org_third_party_skia,mydongistiny/external_chromium_org_third_party_skia,google/skia,pcwalton/skia,VRToxin-AOSP/android_external_skia,MinimalOS-AOSP/platform_external_skia,shahrzadmn/skia,MonkeyZZZZ/platform_external_skia,noselhq/skia,nvoron23/skia,shahrzadmn/skia,AOSPB/external_skia,DiamondLovesYou/skia-sys,amyvmiwei/skia,shahrzadmn/skia,MonkeyZZZZ/platform_external_skia,chenlian2015/skia_from_google,DiamondLovesYou/skia-sys,MarshedOut/android_external_skia,boulzordev/android_external_skia,Jichao/skia,Infinitive-OS/platform_external_skia,noselhq/skia,android-ia/platform_external_chromium_org_third_party_skia,HalCanary/skia-hc,ominux/skia,MarshedOut/android_external_skia,MarshedOut/android_external_skia,pcwalton/skia,pcwalton/skia,FusionSP/external_chromium_org_third_party_skia,android-ia/platform_external_chromium_org_third_party_skia,HalCanary/skia-hc,ench0/external_chromium_org_third_party_skia,AOSPB/external_skia,Omegaphora/external_chromium_org_third_party_skia,MIPS/external-chromium_org-third_party-skia,nfxosp/platform_external_skia,geekboxzone/lollipop_external_chromium_org_third_party_skia,jtg-gg/skia,AOSPB/external_skia,Hikari-no-Tenshi/android_external_skia,MonkeyZZZZ/platform_external_skia,YUPlayGodDev/platform_external_skia,rubenvb/skia,rubenvb/skia,Fusion-Rom/external_chromium_org_third_party_skia,YUPlayGodDev/platform_external_skia,mydongistiny/external_chromium_org_third_party_skia,Omegaphora/external_chromium_org_third_party_skia,Hikari-no-Tenshi/android_external_skia,TeamTwisted/external_skia,TeamTwisted/external_skia,boulzordev/android_external_skia,TeamEOS/external_chromium_org_third_party_skia,Fusion-Rom/external_chromium_org_third_party_skia,Hikari-no-Tenshi/android_external_skia,geekboxzone/mmallow_external_skia,android-ia/platform_external_chromium_org_third_party_skia,scroggo/skia,pcwalton/skia,Jichao/skia,nvoron23/skia,boulzordev/android_external_skia,MonkeyZZZZ/platform_external_skia,OptiPop/external_chromium_org_third_party_skia,android-ia/platform_external_chromium_org_third_party_skia,TeamExodus/external_skia,google/skia,VRToxin-AOSP/android_external_skia,w3nd1go/android_external_skia,google/skia,todotodoo/skia,DARKPOP/external_chromium_org_third_party_skia,chenlian2015/skia_from_google,DiamondLovesYou/skia-sys,AOSP-YU/platform_external_skia,OneRom/external_skia,MyAOSP/external_chromium_org_third_party_skia,aosp-mirror/platform_external_skia,invisiblek/android_external_skia,Omegaphora/external_chromium_org_third_party_skia,Hikari-no-Tenshi/android_external_skia,OneRom/external_skia,MyAOSP/external_chromium_org_third_party_skia,AOSP-YU/platform_external_skia,PAC-ROM/android_external_skia,samuelig/skia,YUPlayGodDev/platform_external_skia,w3nd1go/android_external_skia,TeamExodus/external_skia,DARKPOP/external_chromium_org_third_party_skia,OneRom/external_skia,aosp-mirror/platform_external_skia,ench0/external_chromium_org_third_party_skia,Igalia/skia,Jichao/skia,aosp-mirror/platform_external_skia,PAC-ROM/android_external_skia,chenlian2015/skia_from_google,OptiPop/external_chromium_org_third_party_skia,w3nd1go/android_external_skia,rubenvb/skia,aosp-mirror/platform_external_skia,ominux/skia,vanish87/skia,todotodoo/skia,Hikari-no-Tenshi/android_external_skia,google/skia,MinimalOS/external_chromium_org_third_party_skia,PAC-ROM/android_external_skia,TeamEOS/external_chromium_org_third_party_skia,geekboxzone/mmallow_external_skia,google/skia,ominux/skia,vanish87/skia,UBERMALLOW/external_skia,vanish87/skia,AOSP-YU/platform_external_skia,DiamondLovesYou/skia-sys,shahrzadmn/skia,tmpvar/skia.cc,FusionSP/external_chromium_org_third_party_skia,noselhq/skia,timduru/platform-external-skia,pcwalton/skia,vanish87/skia,jtg-gg/skia,rubenvb/skia,MonkeyZZZZ/platform_external_skia,tmpvar/skia.cc,BrokenROM/external_skia,ench0/external_chromium_org_third_party_skia,invisiblek/android_external_skia,ench0/external_chromium_org_third_party_skia,TeamTwisted/external_skia,VRToxin-AOSP/android_external_skia,MonkeyZZZZ/platform_external_skia,UBERMALLOW/external_skia,FusionSP/external_chromium_org_third_party_skia,ominux/skia,AOSPB/external_skia,pcwalton/skia,vanish87/skia,noselhq/skia,MinimalOS-AOSP/platform_external_skia,FusionSP/external_chromium_org_third_party_skia,nvoron23/skia,todotodoo/skia,nfxosp/platform_external_skia,BrokenROM/external_skia,MinimalOS-AOSP/platform_external_skia,chenlian2015/skia_from_google,VRToxin-AOSP/android_external_skia,tmpvar/skia.cc,Igalia/skia,TeamExodus/external_skia,scroggo/skia,MarshedOut/android_external_skia,amyvmiwei/skia,MarshedOut/android_external_skia,jtg-gg/skia,vanish87/skia,w3nd1go/android_external_skia,amyvmiwei/skia,chenlian2015/skia_from_google,Infinitive-OS/platform_external_skia,timduru/platform-external-skia,AOSP-YU/platform_external_skia,qrealka/skia-hc,MIPS/external-chromium_org-third_party-skia,Fusion-Rom/external_chromium_org_third_party_skia,PAC-ROM/android_external_skia,Fusion-Rom/external_chromium_org_third_party_skia,TeamTwis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