Change the cpp wrappers of audio input/video capture to use CompletionCallbackWithOutput.

ppapi/cpp/array_output.h

 // Copyright (c) 2012 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.
 
 #ifndef PPAPI_CPP_ARRAY_OUTPUT_H_
 #define PPAPI_CPP_ARRAY_OUTPUT_H_
 
 #include <vector>
 
 #include "ppapi/c/pp_array_output.h"
@@ skipping 183 matching lines @@
 // writing PP_Vars, do this:
 //
 //    VarArrayOutputAdapterWithStorage adapter;
 //    ppb_foo->GetVars(adapter.pp_output_array());
 //    const std::vector<pp::Var>& result = adapter.output().
 //
 // This one is non-inline since it's not templatized.
 class VarArrayOutputAdapterWithStorage : public ArrayOutputAdapter<PP_Var> {
  public:
   VarArrayOutputAdapterWithStorage();
+  virtual ~VarArrayOutputAdapterWithStorage();
 
   // Returns the final array of resource objects, converting the PP_Vars
   // written by the browser to pp::Var objects.
   //
   // This function should only be called once or we would end up converting
   // the array more than once, which would mess up the refcounting.
   std::vector<Var>& output();
 
  private:
   // The browser will write the PP_Vars into this array.
@@ skipping 16 matching lines @@
 //    ppb_foo->GetFiles(adapter.pp_output_array());
 //    std::vector<FileRef> result = adapter.output().
 template<typename T>
 class ResourceArrayOutputAdapterWithStorage
     : public ArrayOutputAdapter<PP_Resource> {
  public:
   ResourceArrayOutputAdapterWithStorage() {
     set_output(&temp_storage_);
   }
 
+  virtual ~ResourceArrayOutputAdapterWithStorage() {
+    if (!temp_storage_.empty()) {
+      // An easy way to release the resource references held by this object.
+      output();
+    }
+  }
+
   // Returns the final array of resource objects, converting the PP_Resources
   // written by the browser to resource objects.
   //
   // This function should only be called once or we would end up converting
   // the array more than once, which would mess up the refcounting.
   std::vector<T>& output() {
     PP_DCHECK(output_storage_.empty());
 
     ConvertPPResourceArrayToObjects(PASS_REF, temp_storage_, &output_storage_);
     temp_storage_.clear();
     return output_storage_;
   }
 
  private:
   // The browser will write the PP_Resources into this array.
   std::vector<PP_Resource> temp_storage_;
 
   // When asked for the output, the resources above will be converted to the
   // C++ resource objects in this array for passing to the calling code.
   std::vector<T> output_storage_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_ARRAY_OUTPUT_H_