Add GetLiveVars to PPB_Testing_Dev. Fix leaks it uncovered.

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_testing.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "native_client/src/shared/ppapi_proxy/plugin_ppb_testing.h"
 
 #include <cstddef>
 #include <new>
+#include <vector>
 
 #include "native_client/src/include/nacl_scoped_ptr.h"
 #include "native_client/src/include/portability.h"
 #include "native_client/src/shared/ppapi_proxy/object_serialize.h"
 #include "native_client/src/shared/ppapi_proxy/plugin_globals.h"
 #include "native_client/src/shared/ppapi_proxy/plugin_callback.h"
+#include "native_client/src/shared/ppapi_proxy/proxy_var_cache.h"
 #include "native_client/src/shared/ppapi_proxy/utility.h"
 #include "ppapi/c/dev/ppb_testing_dev.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/pp_point.h"
 #include "ppapi/c/pp_rect.h"
 #include "srpcgen/ppb_rpc.h"
 
 namespace ppapi_proxy {
 
@@ skipping 113 matching lines @@
   struct PP_Var url = PP_MakeUndefined();
   if (srpc_result == NACL_SRPC_RESULT_OK)
     (void) DeserializeTo(url_bytes.get(), url_size, 1, &url);
 
   DebugPrintf("PPB_Testing::GetDocumentURL: %s\n",
               NaClSrpcErrorString(srpc_result));
 
   return url;
 }
 
+// TODO(dmichael): Ideally we could get a way to check the number of vars in the
+// host-side tracker when running NaCl, to make sure the proxy does not leak
+// host-side vars.
+uint32_t GetLiveVars(PP_Var live_vars[], uint32_t array_size) {
+  std::vector<PP_Var> vars = ProxyVarCache::GetInstance().GetLiveVars();
+  for (size_t i = 0u;
+       i < std::min(static_cast<size_t>(array_size), vars.size());
+       ++i)
+    live_vars[i] = vars[i];
+  return vars.size();
+}
+
 }  // namespace
 
 const PPB_Testing_Dev* PluginTesting::GetInterface() {
   static const PPB_Testing_Dev testing_interface = {
     ReadImageData,
     RunMessageLoop,
     QuitMessageLoop,
     GetLiveObjectsForInstance,
     IsOutOfProcess,
     SimulateInputEvent,
-    GetDocumentURL
+    GetDocumentURL,
+    GetLiveVars
   };
   return &testing_interface;
 }
 
 }  // namespace ppapi_proxy