Add a gRPC repository to DEPS to fetch for Linux platform.

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 411 matching lines @@
     'src/third_party/wayland/src':
      Var('chromium_git') + '/external/anongit.freedesktop.org/git/wayland/wayland.git' + '@' + '7ed00c1de77afbab23f4908fbd9d60ec070c209b',
 
     # Wayland protocols that add functionality not available in the core protocol.
     'src/third_party/wayland-protocols/src':
      Var('chromium_git') + '/external/anongit.freedesktop.org/git/wayland/wayland-protocols.git' + '@' + '83bdaa5cff369cc631d0191eb75a6a798976c638',
 
     # Wireless Display Software. Used on Chrome OS.
     'src/third_party/wds/src':
      Var('chromium_git') + '/external/github.com/01org/wds' + '@' + 'ac3d8210d95f3000bf5c8e16a79dbbbf22d554a5',
+
+    # gRPC, an RPC framework. For Blimp use only.
+    'src/third_party/grpc':
+     Var('chromium_git') + '/external/github.com/grpc/grpc' + '@' + 'c1f618fb61b5258c1718e7ae60a6a7dbf6f912fb',
   },
   'android': {
     'src/third_party/android_protobuf/src':
      Var('chromium_git') + '/external/android_protobuf.git' + '@' + '999188d0dc72e97f7fe08bb756958a2cf090f4e7',
 
     'src/third_party/android_tools':
      Var('chromium_git') + '/android_tools.git' + '@' + '5b5f2f60b78198eaef25d442ac60f823142a8a6e',
 
     'src/third_party/apache-mime4j':
      Var('chromium_git') + '/chromium/deps/apache-mime4j.git' + '@' + '28cb1108bff4b6cf0a2e86ff58b3d025934ebe3a',
@@ skipping 411 matching lines @@
                'src/build/android/download_doclava.py',
     ],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     'name': 'gyp',
     'pattern': '.',
     'action': ['python', 'src/build/gyp_chromium', '--running-as-hook'],
   },
 ]