AOSP/Email -Added TEST_MAPPING file and "LOCAL_COMPATIBILITY_SUITE := device-tests" to enable presubmit tests for Email.

Bug: 127848297

Test: manual - Ran the following tests on Pixel phone. Tested the email UI.

$ make -j 40
$ make EmailTests -j

$ find out -name "Email*apk" -print -exec ls -l {} \;
  out/target/product/marlin/testcases/EmailTests/arm64/EmailTests.apk
    -rw-r--r-- 1 rtenneti primarygroup 397791 Jul  2 11:24 out/target/product/marlin/testcases/EmailTests/arm64/EmailTests.apk

  out/target/product/marlin/testcases/Email/arm64/Email.apk
    -rw-r--r-- 1 rtenneti primarygroup 6367434 Jul  1 13:15 out/target/product/marlin/testcases/Email/arm64/Email.apk

$ adb install -r out/target/product/marlin/testcases/Email/arm64/Email.apk
$ adb install -r out/target/product/marlin/testcases/EmailTests/arm64/EmailTests.apk

$ adb shell am instrument -w com.android.email.tests
  Time: 34.632
  OK (157 tests)

$ atest EmailTests
  ...
  [100% 10/10] Copy: out/target/product/marlin/testcases/EmailTests/arm64/EmailTests.apk
  2019-07-02 11:29:03 atest_utils.py:164:INFO: Build successful

  Running Tests...

  EmailTests (157 Tests)
  ---------------------
  [1/157] com.android.email.DummyFlakyTest#imNotReallyFlaky: PASSED (1ms)
  ...
  [157/157] com.android.emailcommon.utility.UtilityTest#testParseEmailDateTime: PASSED (0ms)

  Summary
  -------
  EmailTests: Passed: 157, Failed: 0, Ignored: 0, Assumption Failed: 0

  All tests passed!

Change-Id: I5bacfbf4178d3859a3f6541c45fad52111385268
5 files changed