A recent change to runtest resulted in absolute paths incorrectly
being used for a tests build path. This broke the special logic
for frameworks/base tests, since it assumed relative build paths.
Change build paths back to relative paths.

Bug 5105885

Change-Id: I83a26be25294d501cca73eb1b88a7364131b2caf

Bug 4556556

Change-Id: I3f829cae8f9fc1e64b3a44ac9e306b13b3cead7c

This is a rough initial version. It makes several assumptions:
 - assumes each test source file is built into module with name equal
to basename of source file
 - assumes tests get installed into /data/nativetest

However, given those assumptions, both:
$ runtest --path <path to directory containing gtest source> and
$ runtest --path <path to single source file>
should work.

Coming soon: gtest host support

Bugs 4563370, 4584339

Change-Id: Ia42aeed7f9ee6402b0ceb7b5ccaaa66ac636fe49

Merge commit 'e98ed06e17e28a11609caf133a08b3ced21a049a'

* commit 'e98ed06e17e28a11609caf133a08b3ced21a049a':
  Make runtest --path smarter when choosing path to build.

Merge commit 'd9380caf410ddf4b17a6e5035a89851bc58408f7' into gingerbread-plus-aosp

* commit 'd9380caf410ddf4b17a6e5035a89851bc58408f7':
  Make runtest --path smarter when choosing path to build.

The command 'runtest --path <path to parent folder>'
is intended to find and build all tests contained within that parent folder.

However, the runtest logic was flawed in that it assumed building a parent
folder's Android.mk file would build all sub-directories.

This commit changes runtest to explictly look for the rule to build
sub-dir makefiles when creating the set of dirs to build.

Change-Id: Ia7f2172c1be79be8589be5f435fc4fb32569c994

Merge commit 'd53cf3ba04f48d234200e8418876db62cb0b6b56'

* commit 'd53cf3ba04f48d234200e8418876db62cb0b6b56':
  Change hosttestlib to use ddm-prebuilt.

Merge commit '8ddb2873df96c7181c9358f5c9286e273648bf89' into gingerbread-plus-aosp

* commit '8ddb2873df96c7181c9358f5c9286e273648bf89':
  Change hosttestlib to use ddm-prebuilt.

Change-Id: Ibd1c44096893bc8804a4d7644fc83d2edd443bb2