Allow multiple 'parcelable' declarations in aidl files

This solves a problem with declaring multiple Parcelable static inner
classes.

Change-Id: I5e42b412d6d937df19a388988be5aa58a8dbc3e4

Author: adamp

tools/aidl/aidl.cpp

@@ -590,17 +590,15 @@ exactly_one_interface(const char* filename, const document_item_type* items, con
     }
 
     const document_item_type* next = items->next;
-    if (items->next != NULL) {
+    // Allow parcelables to skip the "one-only" rule.
+    if (items->next != NULL && next->item_type != USER_DATA_TYPE) {
         int lineno = -1;
         if (next->item_type == INTERFACE_TYPE_BINDER) {
             lineno = ((interface_type*)next)->interface_token.lineno;
         }
         else if (next->item_type == INTERFACE_TYPE_RPC) {
             lineno = ((interface_type*)next)->interface_token.lineno;
         }
-        else if (next->item_type == USER_DATA_TYPE) {
-            lineno = ((user_data_type*)next)->keyword_token.lineno;
-        }
         fprintf(stderr, "%s:%d aidl can only handle one interface per file\n",
                             filename, lineno);
         return 1;