Cast audio only policy enforcement support.

extensions/browser/api/cast_channel/cast_socket.h

Index: extensions/browser/api/cast_channel/cast_socket.h
diff --git a/extensions/browser/api/cast_channel/cast_socket.h b/extensions/browser/api/cast_channel/cast_socket.h
index 2cb56a6ea538d35accf0e6dfdb705d0fa2f69bec..3d89c2dadfd7c8755cbf70f1a942c4b3a4e02ba1 100644
--- a/extensions/browser/api/cast_channel/cast_socket.h
+++ b/extensions/browser/api/cast_channel/cast_socket.h
@@ -42,6 +42,16 @@ class Logger;
 struct LastErrors;
 class MessageFramer;
 
+// Cast device capabilities.
+enum CastDeviceCapability {
+  NONE = 0,
+  VIDEO_OUT = 1 << 0,
+  VIDEO_IN = 1 << 1,
+  AUDIO_OUT = 1 << 2,
+  AUDIO_IN = 1 << 3,
+  DEV_MODE = 1 << 4
+};
+
 // Public interface of the CastSocket class.
 class CastSocket : public ApiResource {
  public:
@@ -125,7 +135,8 @@ class CastSocketImpl : public CastSocket {
                  ChannelAuthType channel_auth,
                  net::NetLog* net_log,
                  const base::TimeDelta& connect_timeout,
-                 const scoped_refptr<Logger>& logger);
+                 const scoped_refptr<Logger>& logger,
+                 long device_capabilities);
 
   // Ensures that the socket is closed.
   ~CastSocketImpl() override;
@@ -165,6 +176,11 @@ class CastSocketImpl : public CastSocket {
   // by the caller (e.g. a mock).
   void SetTransportForTesting(scoped_ptr<CastTransport> transport);
 
+  // Verifies whether the socket complies with cast channel policy.
+  // Audio only channel policy mandates that a device declaring a video out
+  // capability must not have a certificate with audio only policy.
+  bool VerifyChannelPolicy(const AuthResult& result);
+
   // Delegate for receiving handshake messages/errors.
   AuthTransportDelegate auth_delegate_;
 
@@ -294,6 +310,9 @@ class CastSocketImpl : public CastSocket {
   // canceled.
   bool is_canceled_;
 
+  // Capabilities declared by the cast device.
+  long device_capabilities_;
+
   // Connection flow state machine state.
   proto::ConnectionState connect_state_;