Provide a safer URLLoader ReadResponseBody API

ppapi/thunk/ppb_url_loader_api.h

Index: ppapi/thunk/ppb_url_loader_api.h
diff --git a/ppapi/thunk/ppb_url_loader_api.h b/ppapi/thunk/ppb_url_loader_api.h
index 0fe8e04e814513323c4f46d7e300f4ecc0594ce9..f9ac8ebf7a30cac14af6882725717319bd3908a6 100644
--- a/ppapi/thunk/ppb_url_loader_api.h
+++ b/ppapi/thunk/ppb_url_loader_api.h
@@ -41,6 +41,10 @@ class PPB_URLLoader_API {
   virtual int32_t ReadResponseBody(void* buffer,
                                    int32_t bytes_to_read,
                                    scoped_refptr<TrackedCallback> callback) = 0;
+  virtual int32_t ReadResponseBodyToArray(
+      int32_t max_read_length,
+      PP_ArrayOutput* buffer,
+      scoped_refptr<TrackedCallback> callback) = 0;
   virtual int32_t FinishStreamingToFile(
       scoped_refptr<TrackedCallback> callback) = 0;
   virtual void Close() = 0;