Add BuildCommand.GraphsAndBuildTargets
Add BuildCommand.GraphsAndBuildTargets

Summary:
This is a part of series of changes to avoid using `BuildCommand.buildTargets` as a global variable.

Adding a holder to pass graphs and build targets together.

Reviewed By: ttsugriy

fbshipit-source-id: c3ef1cf

LegNeato/buck,brettwooldridge/buck,brettwooldridge/buck,Addepar/buck,nguyentruongtho/buck,shs96c/buck,JoelMarcey/buck,SeleniumHQ/buck,brettwooldridge/buck,rmaz/buck,shs96c/buck,brettwooldridge/buck,LegNeato/buck,JoelMarcey/buck,JoelMarcey/buck,romanoid/buck,shs96c/buck,LegNeato/buck,kageiit/buck,shs96c/buck,shs96c/buck,brettwooldridge/buck,brettwooldridge/buck,JoelMarcey/buck,rmaz/buck,facebook/buck,LegNeato/buck,SeleniumHQ/buck,JoelMarcey/buck,facebook/buck,Addepar/buck,SeleniumHQ/buck,shs96c/buck,rmaz/buck,facebook/buck,kageiit/buck,SeleniumHQ/buck,LegNeato/buck,JoelMarcey/buck,rmaz/buck,SeleniumHQ/buck,facebook/buck,zpao/buck,rmaz/buck,JoelMarcey/buck,JoelMarcey/buck,brettwooldridge/buck,JoelMarcey/buck,SeleniumHQ/buck,brettwooldridge/buck,rmaz/buck,shs96c/buck,facebook/buck,nguyentruongtho/buck,romanoid/buck,shs96c/buck,SeleniumHQ/buck,kageiit/buck,brettwooldridge/buck,zpao/buck,romanoid/buck,Addepar/buck,LegNeato/buck,nguyentruongtho/buck,Addepar/buck,JoelMarcey/buck,Addepar/buck,Addepar/buck,SeleniumHQ/buck,zpao/buck,SeleniumHQ/buck,rmaz/buck,nguyentruongtho/buck,romanoid/buck,romanoid/buck,facebook/buck,LegNeato/buck,facebook/buck,Addepar/buck,kageiit/buck,brettwooldridge/buck,Addepar/buck,nguyentruongtho/buck,JoelMarcey/buck,zpao/buck,rmaz/buck,shs96c/buck,brettwooldridge/buck,LegNeato/buck,shs96c/buck,rmaz/buck,rmaz/buck,romanoid/buck,zpao/buck,LegNeato/buck,romanoid/buck,LegNeato/buck,romanoid/buck,romanoid/buck,Addepar/buck,kageiit/buck,nguyentruongtho/buck,JoelMarcey/buck,LegNeato/buck,SeleniumHQ/buck,JoelMarcey/buck,LegNeato/buck,shs96c/buck,brettwooldridge/buck,shs96c/buck,Addepar/buck,kageiit/buck,zpao/buck,SeleniumHQ/buck,zpao/buck,rmaz/buck,LegNeato/buck,romanoid/buck,romanoid/buck,rmaz/buck,Addepar/buck,brettwooldridge/buck,rmaz/buck,Addepar/buck,romanoid/buck,SeleniumHQ/buck,Addepar/buck,kageiit/buck,nguyentruongtho/buck,shs96c/buck,romanoid/buck,SeleniumHQ/buck