Loads CastEglPlatform implementation from shared library.

chromecast/chromecast.gyp

Index: chromecast/chromecast.gyp
diff --git a/chromecast/chromecast.gyp b/chromecast/chromecast.gyp
index b4ef6222233d4892d06cdc72949aaed975535162..15334c57101b07661077921d2cb14062208abfb7 100644
--- a/chromecast/chromecast.gyp
+++ b/chromecast/chromecast.gyp
@@ -10,6 +10,7 @@
     'chromium_code': 1,
     'chromecast_branding%': 'Chromium',
     'disable_display%': 0,
+    'ozone_platform_cast%': 0,
     'use_chromecast_webui%': 0,
   },
   'includes': [
@@ -31,6 +32,8 @@
       'target_name': 'cast_public_api',
       'type': '<(component)',
       'sources': [
+        'public/cast_egl_platform.h',
+        'public/cast_egl_platform_shlib.h',
         'public/chromecast_export.h',
       ],
     },
@@ -104,6 +107,13 @@
         'ozone/surface_ozone_egl_cast.cc',
         'ozone/surface_ozone_egl_cast.h',
       ],
+      'conditions': [
+        ['ozone_platform_cast==1', {
+          'dependencies': [
+            '<(cast_vendor_gyp):libcast_graphics_1.0'
+          ],
+        }],
+      ],
     },
     {
       'target_name': 'cast_shell_resources',