Add CHROMECAST_EXPORT definition for OEM shlib replacement

chromecast/chromecast.gyp

 # Copyright 2014 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': {
     'android_support_v13_target%':
         '../third_party/android_tools/android_tools.gyp:android_support_v13_javalib',
     'cast_build_release': 'internal/build/cast_build_release',
     'chromium_code': 1,
     'chromecast_branding%': 'Chromium',
     'disable_display%': 0,
     'use_chromecast_webui%': 0,
   },
   'includes': [
     'chromecast_tests.gypi',
   ],
   'target_defaults': {
     'include_dirs': [
       '..',  # Root of Chromium checkout
     ],
     'conditions': [
       ['disable_display==1', {
         'defines': ['DISABLE_DISPLAY'],
       }],
     ],
   },
   'targets': [
+    # Public API target for OEM partners to replace shlibs.
+    {
+      'target_name': 'cast_public_api',
+      'type': '<(component)',
+      'sources': [
+        'chromecast_export.h',
+      ],
+    },
     # TODO(gunsch): Remove this fake target once it's either added or no
     # longer referenced from internal code.
     {'target_name': 'cast_media_audio', 'type': 'none'},
 
     {
       'target_name': 'cast_base',
       'type': '<(component)',
       'dependencies': [
         '../base/base.gyp:base',
       ],
@@ skipping 509 matching lines @@
           # TODO(dougsteed): remove when Chromecast moves to boringssl.
           # Allow the cast shell to find the NSS module in the same directory.
           'ldflags': [
             '-Wl,-rpath=\$$ORIGIN'
           ],
         },
       ],  # end of targets
     }],
   ],  # end of conditions
 }