Add inherited libs and lib_dirs to GN.

The libs and lib_dirs are pushed up the tree until they reach a shared library or executable. Additionally, I added prefixes in the toolchain to specify these.

This converts ldflags to be per-target rather than inherited which was previously used to implement this feature.

Rename includes to include_dirs for consistency with lib_dirs.

Remove the sill swap_in_* inline functions and just do foo().swap().

BUG=
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/26074002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227328 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227328
PNaCl documentation: fold the dev speak community section into publications and presentations.

R= eliben@chromium.org, dschuff@chromium.org,  mackinlay@chromium.org, binji@chromium.org, sbc@chromium.org
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3634
NOTRY=true

Review URL: https://codereview.chromium.org/25658004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227330 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227330