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After this CL, if the feature_flags attribute of android_test or
android_binary is not set, no transition takes place when entering that
rule. This means that if it is depended upon by another test or binary, it
will use the enclosing test or binary's flags.
This permits users of feature flags to depend on non-users of feature flags.
The opposite is still not permitted. If a dep sets feature flags, then the
target depending on it must have the exact same feature flags set.
This way, all targets used in an android_test are built the same way, but
it's possible to interoperate with targets which are agnostic to feature
flags.
Note that "not set" is different from "set to the empty dictionary"; the
former reuses the definitions set higher up in the build graph, while the
latter clears all feature flag values and resets them to their defaults.
RELNOTES: None.
PiperOrigin-RevId: 167035122
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