Factor out encoded length calculation in AsyncResourceHandler

BUG=580928

Review URL: https://codereview.chromium.org/1626213002

Cr-Commit-Position: refs/heads/master@{#372041}

content/browser/loader/async_resource_handler.cc

@@ -331,10 +331,7 @@ bool AsyncResourceHandler::OnReadCompleted(int bytes_read, bool* defer) {
   }
 
   int data_offset = buffer_->GetLastAllocationOffset();
-
-  int64_t current_transfer_size = request()->GetTotalReceivedBytes();
-  int encoded_data_length = current_transfer_size - reported_transfer_size_;
-  reported_transfer_size_ = current_transfer_size;
+  int encoded_data_length = CalculateEncodedDataLengthToReport();
 
   // TODO(erikchen): Temporary debugging. http://crbug.com/527588.
   CHECK_LE(data_offset, kBufferSize);
@@ -355,9 +352,7 @@ bool AsyncResourceHandler::OnReadCompleted(int bytes_read, bool* defer) {
 }
 
 void AsyncResourceHandler::OnDataDownloaded(int bytes_downloaded) {
-  int64_t current_transfer_size = request()->GetTotalReceivedBytes();
-  int encoded_data_length = current_transfer_size - reported_transfer_size_;
-  reported_transfer_size_ = current_transfer_size;
+  int encoded_data_length = CalculateEncodedDataLengthToReport();
 
   ResourceMessageFilter* filter = GetFilter();
   if (filter) {
@@ -455,4 +450,11 @@ bool AsyncResourceHandler::CheckForSufficientResource() {
   return false;
 }
 
+int AsyncResourceHandler::CalculateEncodedDataLengthToReport() {
+  int64_t current_transfer_size = request()->GetTotalReceivedBytes();
+  int encoded_data_length = current_transfer_size - reported_transfer_size_;
+  reported_transfer_size_ = current_transfer_size;
+  return encoded_data_length;
+}
+
 }  // namespace content

content/browser/loader/async_resource_handler.h

@@ -66,6 +66,7 @@ class AsyncResourceHandler : public ResourceHandler,
   void ResumeIfDeferred();
   void OnDefer();
   bool CheckForSufficientResource();
+  int CalculateEncodedDataLengthToReport();
 
   scoped_refptr<ResourceBuffer> buffer_;
   ResourceDispatcherHostImpl* rdh_;