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

ppapi/cpp/dev/resource_array_dev.h

Index: ppapi/cpp/dev/resource_array_dev.h
diff --git a/ppapi/cpp/dev/resource_array_dev.h b/ppapi/cpp/dev/resource_array_dev.h
index 9d9635cf5480ed2a4f0f1b9a09b832ee0039df44..f9daf5f0320d82a8c4836f87097cf2b262f15816 100644
--- a/ppapi/cpp/dev/resource_array_dev.h
+++ b/ppapi/cpp/dev/resource_array_dev.h
@@ -5,6 +5,8 @@
 #ifndef PPAPI_CPP_DEV_RESOURCE_ARRAY_DEV_H_
 #define PPAPI_CPP_DEV_RESOURCE_ARRAY_DEV_H_
 
+#include "ppapi/c/pp_array_output.h"
+#include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/cpp/resource.h"
 
@@ -14,6 +16,21 @@ class InstanceHandle;
 
 class ResourceArray_Dev : public Resource {
  public:
+  // Heap-allocated data passed to ArrayOutputCallbackConverter(). Please see
+  // the comment of ArrayOutputCallbackConverter() for more details.
+  struct ArrayOutputCallbackData {
+    ArrayOutputCallbackData(const PP_ArrayOutput& array_output,
+                            const PP_CompletionCallback& callback)
+        : resource_array_output(0),
+          output(array_output),
+          original_callback(callback) {
+    }
+
+    PP_Resource resource_array_output;
+    PP_ArrayOutput output;
+    PP_CompletionCallback original_callback;
+  };
+
   ResourceArray_Dev();
 
   ResourceArray_Dev(PassRef, PP_Resource resource);
@@ -31,6 +48,22 @@ class ResourceArray_Dev : public Resource {
   uint32_t size() const;
 
   PP_Resource operator[](uint32_t index) const;
+
+  // This is an adapter for backward compatibility. It works with those APIs
+  // which take a PPB_ResourceArray_Dev resource as output parameter, and
+  // returns results using PP_ArrayOutput. For example:
+  //
+  //   ResourceArray_Dev::ArrayOutputCallbackData* data =
+  //       new ResourceArray_Dev::ArrayOutputCallbackData(
+  //           pp_array_output, callback);
+  //   ppb_foo->Bar(
+  //       foo_resource, &data->resource_array_output,
+  //       PP_MakeCompletionCallback(
+  //           &ResourceArray_Dev::ArrayOutputCallbackConverter, data));
+  //
+  // It takes a heap-allocated ArrayOutputCallbackData struct passed as the user
+  // data, and deletes it when the call completes.
+  static void ArrayOutputCallbackConverter(void* user_data, int32_t result);
 };
 
 }  // namespace pp