Add Promises for EME (Chromium side)

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git -w <gclientdir>
 # where <gcliendir> is the absolute path to the directory containing the
 # .gclient file (the parent of "src").
 #
@@ skipping 279 matching lines @@
     Var("chromium_git") + "/external/web-page-replay.git@" +
     "d1447899a2176bc8700865e76ed70da329628abd",
 
   "src/third_party/pywebsocket/src":
     (Var("googlecode_url") % "pywebsocket") + "/trunk/src@790",
 
   "src/third_party/opus/src":
     "/trunk/deps/third_party/opus@256783",
 
   "src/media/cdm/ppapi/api":
-    "/trunk/deps/cdm@262570",
+    "/trunk/deps/cdm@273356",
 
   "src/third_party/mesa/src":
     "/trunk/deps/third_party/mesa@265279",
 
   "src/third_party/cld_2/src":
     (Var("googlecode_url") % "cld2") + "/trunk@161",
 
   "src/chrome/browser/resources/pdf/html_office":
      Var("chromium_git") +
          "/chromium/html-office-public.git@eeff97614f65e0578529490d44d412032c3d7359",
@@ skipping 457 matching lines @@
                 "-s", "src/build/linux/bin/eu-strip.sha1",
     ],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "name": "gyp",
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]