Reland 142154: Adds libexif gyp file to third_party to handle image metadata.

libexif source files are added to deps/third_party/libexif(r141967). This change doesn't make us use the library yet, that will be the next step. This is a no-op change from the point of view of the build.

Please find the previous review comments at http://codereview.chromium.org/10391195.

BUG=none
TEST=none
TBR=thestig@chromium.org


Review URL: https://chromiumcodereview.appspot.com/10562037

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@142799 0039d316-1c4b-4281-b951-d872f2087c98

• .gitignore[diff]
• DEPS[diff]
• third_party/libexif/LICENSE[Added - diff]
• third_party/libexif/README.chromium[Added - diff]
• third_party/libexif/chromium.patch[Added - diff]
• third_party/libexif/libexif.def[Added - diff]
• third_party/libexif/libexif.gyp[Added - diff]