Add fontconfig to linux DEPS for embedded builds (reland)

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
 #   gclient runhooks
 # DO NOT CHECK IN CHANGES TO .DEPS.git. It will be automatically updated by
 # a bot when you modify this one.
@@ skipping 477 matching lines @@
       Var("chromiumos_git") + "/third_party/pyelftools.git" +
       "@bdc1d380acd88d4bfaf47265008091483b0d614e",
 
     "src/third_party/undoview":
       "/trunk/deps/third_party/undoview@119694",
 
     "src/third_party/liblouis/src":
       Var("chromium_git") +
       "/external/liblouis.git@3c2daee56250162e5a75830871601d74328d39f5",
 
+    # Used for embedded builds. CrOS & Linux use the system version.
+    "src/third_party/fontconfig/src":
+      Var("chromium_git") + "/external/fontconfig.git" +
+      "@4f944971dac3c0bbc6fdd3bf3123e3c8378a3acb",
   },
   "android": {
     "src/third_party/android_tools":
       Var("chromium_git") + "/android_tools.git" +
       "@25cf2d85072b06f78956ecaacd564ef56a054d65",
 
     "src/third_party/aosp":
       "/trunk/deps/third_party/aosp@148330",
 
     "src/third_party/apache-mime4j":
@@ skipping 200 matching lines @@
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
   {
     # Check for landmines (reasons to clobber the build).
     "name": "landmines",
     "pattern": ".",
     "action": ["python", "src/build/landmines.py"],
   },
 ]