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- Added function of moving raw coverage data in a new utility file and
  corresponding tests.
- Added "use_clang_coverage" arg to run.py and all simulator test
  runner classes.
- Added check of the arg and call to the function in TestRunners after
  running unit tests and EG tests.

Bug: 943883
Change-Id: I5f16c152a38f7a8a3d988aac9e73964d890219b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2048851Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744470}