add LSAN support

--------------------------------------------------------------------------------

#### Description
Not sure if LeakSanitizer is supported on
on pixel with userdebug build android 7.1.2

#### Environment Details
Platform - OSX 10.12.5
Device - Google Pixel, userdebug build NJH47B android-7.1.2_r17
NDK 15.1.4119039

I was trying to use Address Sanitizer on Anroid, I built the 7.1.2 userdebug version on Pixel.

After run ./asan_device_setup, I was able to catch simple use-after-free, stack-overflow and heap-buffer-overflow. However, ASAN seems cant detect simple memory leaks, is LSAN enabled on Android now.

Start with the ./asan_device_setup entry point and the reported Android 7.1.2 userdebug environment on a Google Pixel. Determine whether LeakSanitizer is supported alongside AddressSanitizer for this setup; done means the support status and any required behavior are established for detecting simple memory leaks.

Written by the indexing model from the issue text.