Notify upload progress from batch request to its child requests.

google_apis/drive/drive_api_requests.h

Index: google_apis/drive/drive_api_requests.h
diff --git a/google_apis/drive/drive_api_requests.h b/google_apis/drive/drive_api_requests.h
index 6017799f60decb592e50373118d658d733d617cf..d930f4e87048528ab85dbb60bc66d02236d566bf 100644
--- a/google_apis/drive/drive_api_requests.h
+++ b/google_apis/drive/drive_api_requests.h
@@ -1114,9 +1114,11 @@ class PermissionsInsertRequest : public EntryActionRequest {
 struct BatchUploadChildEntry {
   BatchUploadChildEntry() : request(NULL), prepared(false) {}
   explicit BatchUploadChildEntry(BatchableRequestBase* request)
-      : request(request), prepared(false) {}
+      : request(request), prepared(false), data_offset(0), data_size(0) {}
   BatchableRequestBase* request;
   bool prepared;
+  int64 data_offset;
+  int64 data_size;
 };
 
 class BatchUploadRequest : public UrlFetchRequestBase {
@@ -1155,6 +1157,11 @@ class BatchUploadRequest : public UrlFetchRequestBase {
   void ProcessURLFetchResults(const net::URLFetcher* source) override;
   void RunCallbackOnPrematureFailure(DriveApiErrorCode code) override;
 
+  // content::UrlFetcherDelegate overrides.
+  void OnURLFetchUploadProgress(const net::URLFetcher* source,
+                                int64 current,
+                                int64 total) override;
+
  private:
   typedef void* RequestID;
   // Obtains corresponding child entry of |request_id|. Returns NULL if the
@@ -1184,6 +1191,9 @@ class BatchUploadRequest : public UrlFetchRequestBase {
   // Multipart of child requests.
   ContentTypeAndData upload_content_;
 
+  // Last reported progress value.
+  int64 last_progress_value_;
+
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<BatchUploadRequest> weak_ptr_factory_;