Implement native bindings for cast extensions API

chrome/chrome_renderer.gypi

Index: chrome/chrome_renderer.gypi
diff --git a/chrome/chrome_renderer.gypi b/chrome/chrome_renderer.gypi
index 04a471a8496a850c90159c79aee9240fb1c75fa5..6867b806042c4b6e1b054d270dc134014d119c9f 100644
--- a/chrome/chrome_renderer.gypi
+++ b/chrome/chrome_renderer.gypi
@@ -385,6 +385,8 @@
         }],
         ['enable_webrtc==0', {
           'sources!': [
+            'renderer/extensions/webrtc_native_handler.cc',
+            'renderer/extensions/webrtc_native_handler.h',
             'renderer/media/chrome_webrtc_log_message_delegate.cc',
             'renderer/media/chrome_webrtc_log_message_delegate.h',
             'renderer/media/webrtc_logging_message_filter.cc',
@@ -465,6 +467,13 @@
             }],
           ],
         }],
+        ['OS != "ios"', {
+          'dependencies': [
+            # TODO(hclam): See crbug.com/298380 for details.
+            # We should isolate the APIs needed by the renderer.
+            '<(DEPTH)/chrome/common/extensions/api/api.gyp:api',
+          ],
+        }],
       ],
     },
   ],