Implement GetUploadStatusOperation on GData WAPI.

chrome/browser/google_apis/gdata_wapi_operations.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_GOOGLE_APIS_GDATA_WAPI_OPERATIONS_H_
 #define CHROME_BROWSER_GOOGLE_APIS_GDATA_WAPI_OPERATIONS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 543 matching lines @@
   // content::UrlFetcherDelegate overrides.
   virtual void OnURLFetchUploadProgress(const net::URLFetcher* source,
                                         int64 current, int64 total) OVERRIDE;
 
  private:
   const ResumeUploadParams params_;
 
   DISALLOW_COPY_AND_ASSIGN(ResumeUploadOperation);
 };
 
+//========================== GetUploadStatusOperation ==========================
+
+// This class performs the operation for getting the current upload status
+// of a file.

[satorux1, 2013/02/07 05:38:57]

Could you be more specific? What data we can get from this operation?

[hidehiko, 2013/02/07 06:34:57]

Done.

+class GetUploadStatusOperation : public UploadRangeOperationBase {
+ public:
+  // |callback| must not be null. See also UploadRangeOperationBase's
+  // constructor for more details.
+  // |content_length| is the whole data size to be uploaded, or -1 if it is
+  // unknown.
+  GetUploadStatusOperation(
+      OperationRegistry* registry,
+      net::URLRequestContextGetter* url_request_context_getter,
+      const UploadRangeCallback& callback,
+      UploadMode load_mode,
+      const FilePath& drive_file_path,
+      const GURL& upload_url,
+      int64 content_length);
+  virtual ~GetUploadStatusOperation();
+
+ protected:
+  // UrlFetchOperationBase overrides.
+  virtual std::vector<std::string> GetExtraRequestHeaders() const OVERRIDE;
+
+ private:
+  const int64 content_length_;
+
+  DISALLOW_COPY_AND_ASSIGN(GetUploadStatusOperation);
+};
+
 }  // namespace google_apis
 
 #endif  // CHROME_BROWSER_GOOGLE_APIS_GDATA_WAPI_OPERATIONS_H_