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..9c31cd3b7756ecdf2e955e63e5a90110f002e58f 100644
--- a/content/browser/loader/async_resource_handler.h
+++ b/content/browser/loader/async_resource_handler.h
@@ -11,7 +11,6 @@
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/timer/timer.h"
 #include "content/browser/loader/resource_handler.h"
 #include "content/browser/loader/resource_message_delegate.h"
 #include "content/common/content_export.h"
@@ -25,6 +24,7 @@ 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 +59,6 @@ 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 +87,7 @@ 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_;