+ For bug 1810508
- Added PerformanceCollector class to collect runtime and memory usage data
* Moved performance snapshotting from Intrumentation to PerformanceCollector
- Added PerformanceResultsWriter interface which defines functions for
reporting performance data
+ Framework integration
- Added TimedTest annotation to automatically time tests and write results
to instrumentation output
- Modified PerformanceTestBase to add collection hooks and wrapper methods
- Modified WatcherResultPrinter in InstrumentationTestRunner to implement
PerformanceResultsWriter for instrumentation output of performance data
- Modified InstrumentationTestRunner and AndroidTestRunner to pass writer
instance to test
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