Fix the Download Notifications for Offline Pages to indicate bytes loaded.

components/offline_pages/core/background/offliner_stub.cc

Index: components/offline_pages/core/background/offliner_stub.cc
diff --git a/components/offline_pages/core/background/offliner_stub.cc b/components/offline_pages/core/background/offliner_stub.cc
index c007ae0a0aa54edb3e1e020de51101aa8ea367ee..04fe6eae1341d75923a1ecc128c7323266869d3c 100644
--- a/components/offline_pages/core/background/offliner_stub.cc
+++ b/components/offline_pages/core/background/offliner_stub.cc
@@ -19,17 +19,22 @@ OfflinerStub::OfflinerStub()
 OfflinerStub::~OfflinerStub() {}
 
 bool OfflinerStub::LoadAndSave(const SavePageRequest& request,
-                               const CompletionCallback& callback) {
+                               const CompletionCallback& completion_callback,
+                               const ProgressCallback& progress_callback) {
   if (disable_loading_)
     return false;
 
-  callback_ = callback;
+  completion_callback_ = completion_callback;
+  progress_callback_ = progress_callback;
 
   // Post the callback on the run loop.
   if (enable_callback_) {
+    const int64_t arbitrary_size = 153LL;
     base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE,
-        base::Bind(callback, request, Offliner::RequestStatus::SAVED));
+        FROM_HERE, base::Bind(progress_callback_, request, arbitrary_size));
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
+        FROM_HERE, base::Bind(completion_callback_, request,
+                              Offliner::RequestStatus::SAVED));
   }
   return true;
 }
@@ -42,8 +47,8 @@ void OfflinerStub::Cancel(const CancelCallback& callback) {
 bool OfflinerStub::HandleTimeout(const SavePageRequest& request) {
   if (snapshot_on_last_retry_) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE,
-        base::Bind(callback_, request, Offliner::RequestStatus::SAVED));
+        FROM_HERE, base::Bind(completion_callback_, request,
+                              Offliner::RequestStatus::SAVED));
     return true;
   }
   return false;