Change coverage dump to specify the output file instead of directory.

Bug: 137857876
Test: manual
Change-Id: I2d835856d7a1b6b1ded561eca923f455b39317e4
Merged-In: I2d835856d7a1b6b1ded561eca923f455b39317e4
(cherry picked from commit 05b1c06a91b54321bd2b329916ea0702a020d12e)
2 files changed