Add config angle_maybe_has_histograms to angle_perftests_common. ANGLE_HAS_HISTOGRAMS wasn't consistently defined in compilation targets. I was working on a prototype and ran into crashes due to an inline function in TestSuite (where this class is used) getting invalid offsets in some cases due to this :-O Shabi: """ angle_source_set makes something the equivalent of a temporary .a, so objects are not recompiled for every target that links to it """ Also change ANGLE_HAS_HISTOGRAMS to =1 or =0 as Yuly suggested so that we can check if it's defined in the header to avoid inconsistency. Bug: angleproject:7299 Change-Id: I907184a6ca2bc673f5bffc473b584d78625a11c8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3817602 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Auto-Submit: Roman Lavrov <romanl@google.com> Commit-Queue: Roman Lavrov <romanl@google.com>