third_party: Add wayland_drm_protocol target to third_party/mesa.

DEPS

 # This file is used to manage the dependencies of the Chromium src repo. It is
 # used by gclient to determine what version of each dependency to check out, and
 # where.
 #
 # For more information, please refer to the official documentation:
 #   https://sites.google.com/a/chromium.org/dev/developers/how-tos/get-the-code
 #
 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 #
@@ skipping 234 matching lines @@
   'src/third_party/pywebsocket/src':
     Var('chromium_git') + '/external/github.com/google/pywebsocket.git' + '@' + '09d842794c14ca064f8a4223b313ac2c84bd33c8',
 
   'src/third_party/opus/src':
    Var('chromium_git') + '/chromium/deps/opus.git' + '@' + 'cae696156f1e60006e39821e79a1811ae1933c69',
 
   'src/media/cdm/api':
    Var('chromium_git') + '/chromium/cdm.git' + '@' + 'a4773c3cec827c3a880e8a2c22e43a287ced0d20',
 
   'src/third_party/mesa/src':
-   Var('chromium_git') + '/chromium/deps/mesa.git' + '@' + 'a3dc7d623fbb83a6246adf3d363922ad3909c14c',
+   Var('chromium_git') + '/chromium/deps/mesa.git' + '@' + 'ef811c6bd4de74e13e7035ca882cc77f85793fef',
 
   'src/third_party/cld_2/src':
     Var('chromium_git') + '/external/github.com/CLD2Owners/cld2.git' + '@' + '84b58a5d7690ebf05a91406f371ce00c3daf31c0',
 
   'src/third_party/libwebm/source':
    Var('chromium_git') + '/webm/libwebm.git' + '@' + '75a6d2da8b63e0c446ec0ce1ac942c2962d959d7',
 
   'src/third_party/pdfium':
    'https://pdfium.googlesource.com/pdfium.git' + '@' +  Var('pdfium_revision'),
 
@@ skipping 544 matching lines @@
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     'name': 'gyp',
     'pattern': '.',
     'action': ['python', 'src/build/gyp_chromium'],
   },
 ]