Factor out upload progress handling from AsyncResourceHandler

content/browser/loader/async_resource_handler.h

Index: content/browser/loader/async_resource_handler.h
diff --git a/content/browser/loader/async_resource_handler.h b/content/browser/loader/async_resource_handler.h
index 1279d506be3529f17b4208d80e247f5f5e4d2023..a02a57c5b4152a81c4de3062c7bdf139ab80d4c6 100644
--- a/content/browser/loader/async_resource_handler.h
+++ b/content/browser/loader/async_resource_handler.h
@@ -25,6 +25,7 @@ class URLRequest;
 namespace content {
 class ResourceBuffer;
 class ResourceDispatcherHostImpl;
+class UploadProgressTracker;
 
 // Used to complete an asynchronous resource request in response to resource
 // load events from the resource dispatcher host.
@@ -59,8 +60,6 @@ class CONTENT_EXPORT AsyncResourceHandler : public ResourceHandler,
   void OnDataReceivedACK(int request_id);
   void OnUploadProgressACK(int request_id);
 
-  void ReportUploadProgress();
-
   bool EnsureResourceBufferIsInitialized();
   void ResumeIfDeferred();
   void OnDefer();
@@ -89,10 +88,7 @@ class CONTENT_EXPORT AsyncResourceHandler : public ResourceHandler,
   std::unique_ptr<InliningHelper> inlining_helper_;
   base::TimeTicks response_started_ticks_;
 
-  uint64_t last_upload_position_;
-  bool waiting_for_upload_progress_ack_;
-  base::TimeTicks last_upload_ticks_;
-  base::RepeatingTimer progress_timer_;
+  std::unique_ptr<UploadProgressTracker> upload_progress_tracker_;
 
   int64_t reported_transfer_size_;