Implement upload progress handling in Mojo loading

content/browser/loader/test_url_loader_client.cc

Index: content/browser/loader/test_url_loader_client.cc
diff --git a/content/browser/loader/test_url_loader_client.cc b/content/browser/loader/test_url_loader_client.cc
index 2ab89597d5f29dbd27dccfdc7e54720d6e1d7f3c..e256ef6a5ac7dcbffa227a1ef26670665f83b2a8 100644
--- a/content/browser/loader/test_url_loader_client.cc
+++ b/content/browser/loader/test_url_loader_client.cc
@@ -62,6 +62,14 @@ void TestURLLoaderClient::OnTransferSizeUpdated(int32_t transfer_size_diff) {
   body_transfer_size_ += transfer_size_diff;
 }
 
+void TestURLLoaderClient::OnUploadProgress(int64_t current_position,
+                                           int64_t total_size,
+                                           const base::Closure& ack_callback) {

[mmenke, 2017/01/18 17:00:46]

Have sanity checks here?  Haven't received redirects / started loading response
body / isn't completed, current_position is not 0, is >
current_upload_position_. and is <= total_size?  Some of these are overkill for
the current set of tests, just thinking they'd be nice to have if we ever add
more upload tests (Due to a bug or something).

[tzik, 2017/01/19 11:53:09]

Done.

+  current_upload_position_ = current_position;
+  total_upload_size_ = total_size;
+  ack_callback.Run();
+}
+
 void TestURLLoaderClient::OnStartLoadingResponseBody(
     mojo::ScopedDataPipeConsumerHandle body) {
   response_body_ = std::move(body);