[cros] Expose libmkv to Chrome.

libvpx.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
   'variables': {
     'conditions': [
       ['os_posix==1', {
         'asm_obj_extension': 'o',
       }],
       ['OS=="win"', {
@@ skipping 90 matching lines @@
                   '-Wno-conversion',
                   # libvpx does `if ((a == b))` in some places.
                   '-Wno-parentheses-equality',
                 ],
               },
               'cflags': [
                 '-Wno-conversion',
                 '-Wno-parentheses-equality',
               ],
             }],
+            [ 'chromeos == 1', {
+              # ChromeOS needs these files for animated WebM avatars.
+              'sources': [
+                'source/libvpx/libmkv/EbmlIDs.h',
+                'source/libvpx/libmkv/EbmlWriter.c',
+                'source/libvpx/libmkv/EbmlWriter.h',
+              ],
+            }],
           ],
         },
       ],
     },
     ],
     # 'libvpx' target for ARM builds.
     [ 'target_arch=="arm" ', {
       'targets': [
         {
           # This libvpx target contains both encoder and decoder.
@@ skipping 68 matching lines @@
             }],
             ['OS == "android"', {
               'include_dirs': [
                 '<(android_ndk_include)',
                 '<(android_ndk_include)/machine',
               ],
               'defines': [
                 'ANDROID_CPU_ARM_FEATURE_NEON=4',
               ],
             }],
+            [ 'chromeos == 1', {
+              # ChromeOS needs these files for animated WebM avatars.
+              'sources': [
+                'source/libvpx/libmkv/EbmlIDs.h',
+                'source/libvpx/libmkv/EbmlWriter.c',
+                'source/libvpx/libmkv/EbmlWriter.h',
+              ],
+            }],
           ],
         },
       ],
     }],
   ],
   'targets': [
     {
       # A tool that runs on host to tract integers from object file.
       'target_name': 'libvpx_obj_int_extract',
       'type': 'executable',
@@ skipping 230 matching lines @@
       ]
     },
   ],
 }
 
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