Added queued SendTo/RecvFrom calls.

ppapi/shared_impl/private/udp_socket_private_impl.h

Index: ppapi/shared_impl/private/udp_socket_private_impl.h
diff --git a/ppapi/shared_impl/private/udp_socket_private_impl.h b/ppapi/shared_impl/private/udp_socket_private_impl.h
index e8e3cb20e401045ff6a09b01ccc10d899beaed26..e48e11b2703005d461736b09a3836403aacd4458 100644
--- a/ppapi/shared_impl/private/udp_socket_private_impl.h
+++ b/ppapi/shared_impl/private/udp_socket_private_impl.h
@@ -5,6 +5,7 @@
 #ifndef PPAPI_SHARED_IMPL_PRIVATE_UDP_SOCKET_PRIVATE_IMPL_H_
 #define PPAPI_SHARED_IMPL_PRIVATE_UDP_SOCKET_PRIVATE_IMPL_H_
 
+#include <queue>
 #include <string>
 
 #include "base/compiler_specific.h"
@@ -73,6 +74,20 @@ class PPAPI_SHARED_EXPORT UDPSocketPrivateImpl
   virtual void SendClose() = 0;
 
  protected:
+  struct RecvFromRequest {
+    RecvFromRequest(scoped_refptr<TrackedCallback> callback,
+                    char* buffer,
+                    int32_t num_bytes)
+        : callback(callback),
+          buffer(buffer),
+          num_bytes(num_bytes) {
+    }
+
+    scoped_refptr<TrackedCallback> callback;
+    char* buffer;
+    int32_t num_bytes;
+  };
+
   void Init(uint32 socket_id);
   void PostAbortIfNecessary(scoped_refptr<TrackedCallback>* callback);
 
@@ -82,11 +97,8 @@ class PPAPI_SHARED_EXPORT UDPSocketPrivateImpl
   bool closed_;
 
   scoped_refptr<TrackedCallback> bind_callback_;
-  scoped_refptr<TrackedCallback> recvfrom_callback_;
-  scoped_refptr<TrackedCallback> sendto_callback_;
-
-  char* read_buffer_;
-  int32_t bytes_to_read_;
+  std::queue<RecvFromRequest> recvfrom_requests_;
+  std::queue<scoped_refptr<TrackedCallback> > sendto_callbacks_;
 
   PP_NetAddress_Private recvfrom_addr_;
   PP_NetAddress_Private bound_addr_;