PPAPI: Support sending browser-hosted resources synchronously

ppapi/proxy/serialized_structs.h

Index: ppapi/proxy/serialized_structs.h
diff --git a/ppapi/proxy/serialized_structs.h b/ppapi/proxy/serialized_structs.h
index f3e114c09fa4fc318de79bb7cc63c7d71688fa15..5ddeee6af3cbcb4776e0f20da89d7b6e849b9a13 100644
--- a/ppapi/proxy/serialized_structs.h
+++ b/ppapi/proxy/serialized_structs.h
@@ -139,6 +139,16 @@ typedef HANDLE ImageHandle;
 typedef base::SharedMemoryHandle ImageHandle;
 #endif
 
+struct CompletedBrowserResourceHosts {
+  CompletedBrowserResourceHosts() : sequence_id(0) {}
+  CompletedBrowserResourceHosts(int sequence_id_param,
+                                const std::vector<int>& host_ids_param)
+      : sequence_id(sequence_id_param), host_ids(host_ids_param) {
+  }
+  int sequence_id;
+  std::vector<int> host_ids;
+};
+
 }  // namespace proxy
 }  // namespace ppapi