Allows matchers to be used for function call verifications.

R=vbhasin,nnaze,chrishenry
DELTA=66 (62 added, 0 deleted, 4 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=6164


git-svn-id: http://closure-library.googlecode.com/svn/trunk@2450 0b95b8e8-c90f-11de-9d4f-f947ee5921c8