Add GetLiveVars to PPB_Testing_Dev. Fix leaks it uncovered.

ppapi/shared_impl/var_tracker.h

Index: ppapi/shared_impl/var_tracker.h
diff --git a/ppapi/shared_impl/var_tracker.h b/ppapi/shared_impl/var_tracker.h
index a2debe0761f7f31ef9a6ccf290e3a3524555e43e..4dc8a2db9742c4da2dc3a0cdad1d185916087f28 100644
--- a/ppapi/shared_impl/var_tracker.h
+++ b/ppapi/shared_impl/var_tracker.h
@@ -5,6 +5,8 @@
 #ifndef PPAPI_SHARED_IMPL_VAR_TRACKER_H_
 #define PPAPI_SHARED_IMPL_VAR_TRACKER_H_
 
+#include <vector>
+
 #include "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
@@ -60,6 +62,12 @@ class PPAPI_SHARED_EXPORT VarTracker {
   // that references it and has an initial reference-count of 1.
   PP_Var MakeArrayBufferPPVar(uint32 size_in_bytes);
 
+  // Return a vector containing all PP_Vars that are in the tracker. This is
+  // to help implement PPB_Testing_Dev.GetLiveVars and should generally not be
+  // used in production code. The PP_Vars are returned in no particular order,
+  // and their reference counts are unaffected.
+  std::vector<PP_Var> GetLiveVars();
+
  protected:
   struct VarInfo {
     VarInfo();