Yao Chen 5154a37930 Adding multi layer aggregation in DurationMetric
Newly supported metrics examples:

1) Compute [Total|Max] duration of [an app] holding [ANY] wake lock while [this app] is in
   [background] and [screen off], bucket size 30seconds, and slice output by uid.

2) Compute [Total|Max] duration of [ANY app] holding [ANY] wake lock while [this app] is in
   [background] and [screen off], bucket size 30 seconds.

+ DurationMetric proto has a "what" which is a SimpleCondition. It defines the atom level start
  and stop of the duration timer, and it has its atom dimension. e.g., for wake locks, the atom
  dimensions wil be uid and wl name.

+ Now dimension is explicitly specified in SimpleCondition proto instead of inferred from the "link"

+ Added support for "Or" and "Max" through 2 layers of aggregation.

TODO: (1) The way we track slicedCondition in duration metric is not efficient. optimize!
      (2) The output dimension should all use int32 instead of KeyMatcher. Fix in a future cl.

Test: Added some unit tests using gmock. Will add more unit tests.

Change-Id: I58a827624f01f9a54fcb80709c4de4ff94a8bc67
2017-11-01 10:07:21 -07:00

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