rollog: Updating common.mk to ToT to enable profiling

This update replaces the current common.mk used in this project with the newest
version. This will allow all of the common.mk based projects to be on the same
version for debugging and enables profiling support.

BUG=chromium-os:37854
TEST=Exectuted the following commands to confirm the build works:
     MODE=profiling cros_workon_make --board=link
     MODE=profiling cros_workon_make --board=link --test
     cros_workon_make --board=link
     cros_workon_make --board=link --test
     Repeated these with emerge-link, USE=profiling, and
     FEATURES=test as need.
     For the emerge command with profiling and testing enable, confirmed the
     appropriate coverage files were created in /usr/share/profiling/...

Change-Id: Iea19155dd82ad508ff1feefaa6e60d4753e65fa5
Reviewed-on: https://gerrit.chromium.org/gerrit/42779
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Tested-by: Ryan Harrison <rharrison@chromium.org>

CHROMIUMOS: Finalize placeholder Makefile for ebuild compatibility.

Copy common.mk locally

BUG=none
TEST=build using this Makefile, see build product works.

Change-Id: I27916cec7c85d5c15513451a016e622e74035dd0
Signed-off-by: Terry Lambert <tlambert@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/26494
Reviewed-by: Mike Frysinger <vapier@chromium.org>

Initial checkin to repo with placeholder Makefile to enable manifest changes.

Change-Id: Ida6f100d9fa534d7748c5b8d9dc1ed7ddf57c099
Signed-off-by: Terry Lambert <tlambert@chromium.org>