erase bitmap inside unit test to make valgrind happier
erase bitmap inside unit test to make valgrind happier

R=mtklein@google.com
TBR=sunshine

Author: halcanary@google.com

Review URL: https://codereview.chromium.org/397273006

tmpvar/skia.cc,amyvmiwei/skia,amyvmiwei/skia,nfxosp/platform_external_skia,VRToxin-AOSP/android_external_skia,MarshedOut/android_external_skia,MinimalOS/android_external_chromium_org_third_party_skia,aosp-mirror/platform_external_skia,qrealka/skia-hc,MyAOSP/external_chromium_org_third_party_skia,geekboxzone/mmallow_external_skia,shahrzadmn/skia,BrokenROM/external_skia,pcwalton/skia,Infinitive-OS/platform_external_skia,spezi77/android_external_skia,FusionSP/external_chromium_org_third_party_skia,android-ia/platform_external_chromium_org_third_party_skia,jtg-gg/skia,HalCanary/skia-hc,invisiblek/android_external_skia,Igalia/skia,DARKPOP/external_chromium_org_third_party_skia,Jichao/skia,PAC-ROM/android_external_skia,Fusion-Rom/external_chromium_org_third_party_skia,google/skia,samuelig/skia,FusionSP/external_chromium_org_third_party_skia,Hikari-no-Tenshi/android_external_skia,Igalia/skia,ominux/skia,mydongistiny/external_chromium_org_third_party_skia,MinimalOS-AOSP/platform_external_skia,scroggo/skia,boulzordev/android_external_skia,geekboxzone/mmallow_external_skia,Infinitive-OS/platform_external_skia,UBERMALLOW/external_skia,samuelig/skia,PAC-ROM/android_external_skia,pcwalton/skia,boulzordev/android_external_skia,todotodoo/skia,TeamTwisted/external_skia,MinimalOS/android_external_chromium_org_third_party_skia,Omegaphora/external_chromium_org_third_party_skia,rubenvb/skia,qrealka/skia-hc,MinimalOS/external_chromium_org_third_party_skia,MonkeyZZZZ/platform_external_skia,samuelig/skia,MinimalOS/android_external_chromium_org_third_party_skia,nvoron23/skia,android-ia/platform_external_chromium_org_third_party_skia,xin3liang/platform_external_chromium_org_third_party_skia,w3nd1go/android_external_skia,AOSP-YU/platform_external_skia,noselhq/skia,qrealka/skia-hc,AOSP-YU/platform_external_skia,invisiblek/android_external_skia,tmpvar/skia.cc,tmpvar/skia.cc,timduru/platform-external-skia,MinimalOS/external_chromium_org_third_party_skia,boulzordev/android_external_skia,AOSPB/external_skia,boulzordev/android_external_skia,BrokenROM/external_skia,HalCanary/skia-hc,chenlian2015/skia_from_google,BrokenROM/external_skia,nvoron23/skia,nvoron23/skia,PAC-ROM/android_external_skia,amyvmiwei/skia,google/skia,MyAOSP/external_chromium_org_third_party_skia,Hikari-no-Tenshi/android_external_skia,Infinitive-OS/platform_external_skia,TeamTwisted/external_skia,UBERMALLOW/external_skia,geekboxzone/mmallow_external_skia,MyAOSP/external_chromium_org_third_party_skia,YUPlayGodDev/platform_external_skia,geekboxzone/mmallow_external_skia,nfxosp/platform_external_skia,amyvmiwei/skia,FusionSP/external_chromium_org_third_party_skia,noselhq/skia,nfxosp/platform_external_skia,HalCanary/skia-hc,boulzordev/android_external_skia,MinimalOS-AOSP/platform_external_skia,mydongistiny/external_chromium_org_third_party_skia,ench0/external_chromium_org_third_party_skia,AOSPB/external_skia,VRToxin-AOSP/android_external_skia,timduru/platform-external-skia,nvoron23/skia,YUPlayGodDev/platform_external_skia,google/skia,BrokenROM/external_skia,google/skia,Jichao/skia,YUPlayGodDev/platform_external_skia,MyAOSP/external_chromium_org_third_party_skia,VRToxin-AOSP/android_external_skia,boulzordev/android_external_skia,TeamEOS/external_chromium_org_third_party_skia,VRToxin-AOSP/android_external_skia,noselhq/skia,MonkeyZZZZ/platform_external_skia,BrokenROM/external_skia,OptiPop/external_chromium_org_third_party_skia,Fusion-Rom/external_chromium_org_third_party_skia,google/skia,amyvmiwei/skia,MonkeyZZZZ/platform_external_skia,spezi77/android_external_skia,TeamTwisted/external_skia,TeamEOS/external_chromium_org_third_party_skia,scroggo/skia,DiamondLovesYou/skia-sys,geekboxzone/mmallow_external_skia,pcwalton/skia,todotodoo/skia,MinimalOS/external_chromium_org_third_party_skia,Jichao/skia,mydongistiny/external_chromium_org_third_party_skia,Infinitive-OS/platform_external_skia,Omegaphora/external_chromium_org_third_party_skia,OptiPop/external_chromium_org_third_party_skia,MinimalOS/android_external_chromium_org_third_party_skia,VRToxin-AOSP/android_external_skia,MyAOSP/external_chromium_org_third_party_skia,chenlian2015/skia_from_google,Omegaphora/external_chromium_org_third_party_skia,aosp-mirror/platform_external_skia,scroggo/skia,jtg-gg/skia,UBERMALLOW/external_skia,todotodoo/skia,DARKPOP/external_chromium_org_third_party_skia,timduru/platform-external-skia,TeamEOS/external_chromium_org_third_party_skia,MIPS/external-chromium_org-third_party-skia,invisiblek/android_external_skia,MIPS/external-chromium_org-third_party-skia,chenlian2015/skia_from_google,AOSPB/external_skia,timduru/platform-external-skia,todotodoo/skia,ominux/skia,xin3liang/platform_external_chromium_org_third_party_skia,UBERMALLOW/external_skia,shahrzadmn/skia,MIPS/external-chromium_org-third_party-skia,mydongistiny/external_chromium_org_third_party_skia,geekboxzone/lollipop_external_chromium_org_third_party_skia,w3nd1go/android_external_skia,TeamEOS/external_chromium_org_third_party_skia,google/skia,nfxos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