Add GetChangelist operation for Drive V2.

chrome/browser/chromeos/gdata/drive_api_operations.h

Index: chrome/browser/chromeos/gdata/drive_api_operations.h
diff --git a/chrome/browser/chromeos/gdata/drive_api_operations.h b/chrome/browser/chromeos/gdata/drive_api_operations.h
index 697f3dea17ccf0e466e135233479db76ae2f1c44..aa455c4bc1f1b6c7037d475eef11be9b7f5e88fe 100644
--- a/chrome/browser/chromeos/gdata/drive_api_operations.h
+++ b/chrome/browser/chromeos/gdata/drive_api_operations.h
@@ -47,6 +47,33 @@ class GetApplistOperation : public GetDataOperation {
   DISALLOW_COPY_AND_ASSIGN(GetApplistOperation);
 };
 
+//============================ GetChangelistOperation ==========================
+
+// This class performs the operation for fetching changelist.
+class GetChangelistOperation : public GetDataOperation {
+ public:
+  // |start_changestamp| specifies the starting point of change list or 0 if
+  // all changes are necessary.
+  // |url| specifies URL for document feed fetching operation. If empty URL is
+  // passed, the default URL is used and returns the first page of the result.
+  // When non-first page result is requested, |url| should be specified.
+  GetChangelistOperation(GDataOperationRegistry* registry,
+                         const GURL& url,
+                         int64 start_changestamp,
+                         const GetDataCallback& callback);
+  virtual ~GetChangelistOperation();
+
+ protected:
+  // Overridden from GetDataOperation.
+  virtual GURL GetURL() const OVERRIDE;
+
+ private:
+  GURL url_;
+  int64 start_changestamp_;
+
+  DISALLOW_COPY_AND_ASSIGN(GetChangelistOperation);
+};
+
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_DRIVE_API_OPERATIONS_H_