Add SK_API to SkTextBlob and SkTextBlobBuilder.
Add SK_API to SkTextBlob and SkTextBlobBuilder.

BUG=skia:2868
R=fmalita@chromium.org, reed@google.com

Author: jbroman@chromium.org

Review URL: https://codereview.chromium.org/497993002

MIPS/external-chromium_org-third_party-skia,MinimalOS/external_chromium_org_third_party_skia,boulzordev/android_external_skia,qrealka/skia-hc,OptiPop/external_chromium_org_third_party_skia,vanish87/skia,pcwalton/skia,MinimalOS-AOSP/platform_external_skia,Infinitive-OS/platform_external_skia,MinimalOS/external_chromium_org_third_party_skia,MarshedOut/android_external_skia,todotodoo/skia,vanish87/skia,geekboxzone/mmallow_external_skia,AOSPB/external_skia,VRToxin-AOSP/android_external_skia,samuelig/skia,HalCanary/skia-hc,mydongistiny/external_chromium_org_third_party_skia,tmpvar/skia.cc,samuelig/skia,AOSPB/external_skia,OneRom/external_skia,OneRom/external_skia,chenlian2015/skia_from_google,ominux/skia,DiamondLovesYou/skia-sys,nvoron23/skia,OptiPop/external_chromium_org_third_party_skia,tmpvar/skia.cc,OptiPop/external_chromium_org_third_party_skia,TeamTwisted/external_skia,MIPS/external-chromium_org-third_party-skia,MinimalOS/android_external_chromium_org_third_party_skia,android-ia/platform_external_chromium_org_third_party_skia,MinimalOS/android_external_chromium_org_third_party_skia,HalCanary/skia-hc,geekboxzone/mmallow_external_skia,geekboxzone/mmallow_external_skia,jtg-gg/skia,ominux/skia,Fusion-Rom/external_chromium_org_third_party_skia,tmpvar/skia.cc,AOSPB/external_skia,AOSP-YU/platform_external_skia,MarshedOut/android_external_skia,qrealka/skia-hc,timduru/platform-external-skia,nfxosp/platform_external_skia,AOSP-YU/platform_external_skia,MyAOSP/external_chromium_org_third_party_skia,VRToxin-AOSP/android_external_skia,ominux/skia,MinimalOS/external_chromium_org_third_party_skia,VRToxin-AOSP/android_external_skia,UBERMALLOW/external_skia,Omegaphora/external_chromium_org_third_party_skia,OptiPop/external_chromium_org_third_party_skia,aosp-mirror/platform_external_skia,noselhq/skia,amyvmiwei/skia,vanish87/skia,nvoron23/skia,timduru/platform-external-skia,TeamTwisted/external_skia,amyvmiwei/skia,nvoron23/skia,MonkeyZZZZ/platform_external_skia,YUPlayGodDev/platform_external_skia,Omegaphora/external_chromium_org_third_party_skia,pcwalton/skia,aosp-mirror/platform_external_skia,TeamEOS/external_chromium_org_third_party_skia,rubenvb/skia,geekboxzone/lollipop_external_chromium_org_third_party_skia,w3nd1go/android_external_skia,OneRom/external_skia,Jichao/skia,Hikari-no-Tenshi/android_external_skia,nvoron23/skia,shahrzadmn/skia,aosp-mirror/platform_external_skia,qrealka/skia-hc,w3nd1go/android_external_skia,scroggo/skia,pcwalton/skia,PAC-ROM/android_external_skia,nfxosp/platform_external_skia,UBERMALLOW/external_skia,rubenvb/skia,UBERMALLOW/external_skia,chenlian2015/skia_from_google,ominux/skia,Igalia/skia,TeamEOS/external_chromium_org_third_party_skia,OneRom/external_skia,Hikari-no-Tenshi/android_external_skia,FusionSP/external_chromium_org_third_party_skia,w3nd1go/android_external_skia,BrokenROM/external_skia,Jichao/skia,boulzordev/android_external_skia,OptiPop/external_chromium_org_third_party_skia,nvoron23/skia,MinimalOS-AOSP/platform_external_skia,qrealka/skia-hc,MonkeyZZZZ/platform_external_skia,mydongistiny/external_chromium_org_third_party_skia,MonkeyZZZZ/platform_external_skia,ominux/skia,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia,AOSPB/external_skia,PAC-ROM/android_external_skia,TeamTwisted/external_skia,Fusion-Rom/external_chromium_org_third_party_skia,PAC-ROM/android_external_skia,HalCanary/skia-hc,MyAOSP/external_chromium_org_third_party_skia,rubenvb/skia,ench0/external_chromium_org_third_party_skia,mydongistiny/external_chromium_org_third_party_skia,AOSP-YU/platform_external_skia,spezi77/android_external_skia,android-ia/platform_external_chromium_org_third_party_skia,android-ia/platform_external_chromium_org_third_party_skia,invisiblek/android_external_skia,tmpvar/skia.cc,TeamExodus/external_skia,BrokenROM/external_skia,w3nd1go/android_external_skia,pcwalton/skia,todotodoo/skia,TeamTwisted/external_skia,nfxosp/platform_external_skia,MIPS/external-chromium_org-third_party-skia,android-ia/platform_external_chromium_org_third_party_skia,VRToxin-AOSP/android_external_skia,ominux/skia,TeamExodus/external_skia,BrokenROM/external_skia,DARKPOP/external_chromium_org_third_party_skia,AOSP-YU/platform_external_skia,nvoron23/skia,rubenvb/skia,boulzordev/android_external_skia,geekboxzone/lollipop_external_chromium_org_third_party_skia,Fusion-Rom/external_chromium_org_third_party_skia,vanish87/skia,Fusion-Rom/external_chromium_org_third_party_skia,Infinitive-OS/platform_external_skia,DARKPOP/external_chromium_org_third_party_skia,timduru/platform-external-skia,scroggo/skia,TeamEOS/external_chromium_org_third_party_skia,chenlian2015/skia_from_google,w3nd1go/android_external_skia,Fusion-Rom/external_chromium_org_third_party_skia,FusionSP/external_chromium_org_third_party_skia,scroggo/skia,TeamTwisted/external_skia,Infinitive-OS/platform_external_skia,YUPlayGodDev/platform_external_skia,chenlian2015/skia_from_google,scroggo/skia,noselhq/skia,Omegaphora/external_chromium_org_third_part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