Add Robolectric build and license files to third_party.

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 458 matching lines @@
 
     'src/third_party/jsr-305/src':
       Var('chromium_git') + '/external/jsr-305.git' + '@' + '642c508235471f7220af6d5df2d3210e3bfc0919',
 
     'src/third_party/junit/src':
       Var('chromium_git') + '/external/junit.git' + '@' + '45a44647e7306262162e1346b750c3209019f2e1',
 
     'src/third_party/mockito/src':
       Var('chromium_git') + '/external/mockito/mockito.git' + '@' + 'ed99a52e94a84bd7c467f2443b475a22fcc6ba8e',
 
+    'src/third_party/robolectric/lib':
+      Var('chromium_git') + '/chromium/third_party/robolectric.git' + '@' + '6b63c99a8b6967acdb42cbed0adb067c80efc810',
+
     'src/third_party/lss':
       Var('chromium_git') + '/external/linux-syscall-support/lss.git' + '@' + Var('lss_revision'),
 
     'src/third_party/requests/src':
       Var('chromium_git') + '/external/github.com/kennethreitz/requests.git' + '@' + 'f172b30356d821d180fa4ecfa3e71c7274a32de4',
 
   },
 }
 
 
@@ skipping 288 matching lines @@
     # corresponding .py files have already been deleted.
     'name': 'remove_stale_pyc_files',
     'pattern': 'src/tools/.*\\.py',
     'action': [
         'python',
         'src/tools/remove_stale_pyc_files.py',
         'src/tools',
     ],
   },
 ]