Adds MediaClientAndroid to support embedder/MediaDrmBridge interaction.

chromecast/media/media.gyp

Index: chromecast/media/media.gyp
diff --git a/chromecast/media/media.gyp b/chromecast/media/media.gyp
index 8b98ec9cbce80993b66ec9545edb72ca92c69a33..3ca9effd2e63cca194a9630030518f1e63de13f8 100644
--- a/chromecast/media/media.gyp
+++ b/chromecast/media/media.gyp
@@ -54,6 +54,14 @@
         'cdm/browser_cdm_cast.cc',
         'cdm/browser_cdm_cast.h',
       ],
+      'conditions': [
+        ['use_playready==1', {
+          'sources': [
+            'cdm/playready_drm_delegate_android.cc',
+            'cdm/playready_drm_delegate_android.h',
+          ],
+        }],
+      ],
     },
     {
       'target_name': 'cma_base',