add guard for SkData proc change
add guard for SkData proc change

BUG=skia:
NOTRY=True
TBR=

Review URL: https://codereview.chromium.org/1178023003

HalCanary/skia-hc,todotodoo/skia,tmpvar/skia.cc,shahrzadmn/skia,qrealka/skia-hc,aosp-mirror/platform_external_skia,Jichao/skia,HalCanary/skia-hc,google/skia,noselhq/skia,aosp-mirror/platform_external_skia,todotodoo/skia,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,ominux/skia,qrealka/skia-hc,Jichao/skia,HalCanary/skia-hc,todotodoo/skia,aosp-mirror/platform_external_skia,google/skia,nvoron23/skia,shahrzadmn/skia,tmpvar/skia.cc,HalCanary/skia-hc,HalCanary/skia-hc,vanish87/skia,google/skia,Jichao/skia,tmpvar/skia.cc,google/skia,pcwalton/skia,vanish87/skia,noselhq/skia,shahrzadmn/skia,pcwalton/skia,nvoron23/skia,noselhq/skia,HalCanary/skia-hc,qrealka/skia-hc,google/skia,rubenvb/skia,rubenvb/skia,Jichao/skia,noselhq/skia,vanish87/skia,Jichao/skia,rubenvb/skia,google/skia,vanish87/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,pcwalton/skia,nvoron23/skia,vanish87/skia,google/skia,ominux/skia,Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,tmpvar/skia.cc,qrealka/skia-hc,vanish87/skia,shahrzadmn/skia,pcwalton/skia,Hikari-no-Tenshi/android_external_skia,vanish87/skia,todotodoo/skia,shahrzadmn/skia,rubenvb/skia,noselhq/skia,ominux/skia,tmpvar/skia.cc,ominux/skia,rubenvb/skia,vanish87/skia,nvoron23/skia,shahrzadmn/skia,noselhq/skia,HalCanary/skia-hc,tmpvar/skia.cc,pcwalton/skia,rubenvb/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,shahrzadmn/skia,todotodoo/skia,google/skia,noselhq/skia,pcwalton/skia,shahrzadmn/skia,todotodoo/skia,noselhq/skia,nvoron23/skia,qrealka/skia-hc,Jichao/skia,nvoron23/skia,vanish87/skia,ominux/skia,noselhq/skia,qrealka/skia-hc,Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,Jichao/skia,shahrzadmn/skia,pcwalton/skia,nvoron23/skia,rubenvb/skia,tmpvar/skia.cc,rubenvb/skia,aosp-mirror/platform_external_skia,rubenvb/skia,nvoron23/skia,nvoron23/skia,qrealka/skia-hc,Hikari-no-Tenshi/android_external_skia,Jichao/skia,google/skia,ominux/skia,pcwalton/skia,ominux/skia,google/skia,Jichao/skia,ominux/skia,qrealka/skia-hc,todotodoo/skia,aosp-mirror/platform_external_skia,ominux/skia,todotodoo/skia,aosp-mirror/platform_external_skia,todotodoo/skia,tmpvar/skia.cc,pcwalton/skia,rubenvb/skia,tmpvar/skia.cc,Hikari-no-Tenshi/android_external_skia