Re-add blink_heap_unittests to android recipe.

This change reverts r248464 and re-lands r248379 with the fix to the
isolate name.

TBR=navabi@chromium.org
BUG=334018

Review URL: https://codereview.chromium.org/149363012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248525 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248525