Adds asynchronous unzip functions to ZipReader

chrome/browser/extensions/api/image_writer_private/operation.h

Index: chrome/browser/extensions/api/image_writer_private/operation.h
diff --git a/chrome/browser/extensions/api/image_writer_private/operation.h b/chrome/browser/extensions/api/image_writer_private/operation.h
index 17a88e9fc5a3638108e605ad8374449fc84417c6..970aafa966c3ccb4245d72f8c7376b08e06cdc50 100644
--- a/chrome/browser/extensions/api/image_writer_private/operation.h
+++ b/chrome/browser/extensions/api/image_writer_private/operation.h
@@ -13,6 +13,7 @@
 #include "chrome/browser/extensions/api/image_writer_private/image_writer_utils.h"
 #include "chrome/common/cancelable_task_tracker.h"
 #include "chrome/common/extensions/api/image_writer_private.h"
+#include "third_party/zlib/google/zip_reader.h"
 
 namespace image_writer_api = extensions::api::image_writer_private;
 
@@ -38,7 +39,7 @@ class OperationManager;
 // for advancing to the next stage and other UI interaction.  The Run phase does
 // the work on the FILE thread and calls SendProgress or Error as appropriate.
 class Operation
-    : public base::RefCountedThreadSafe<Operation> {
+    : public zip::ZipReader::Listener {
  public:
   typedef base::Callback<void(bool, const std::string&)> StartWriteCallback;
   typedef base::Callback<void(bool, const std::string&)> CancelWriteCallback;
@@ -133,6 +134,7 @@ class Operation
   void OnBurnError();
 #endif
 
+  // Incrementally calculates the MD5 sum of a file.
   void MD5Chunk(scoped_ptr<image_writer_utils::ImageReader> reader,
                 int64 bytes_processed,
                 int64 bytes_total,
@@ -140,6 +142,11 @@ class Operation
                 int progress_scale,
                 const base::Callback<void(scoped_ptr<std::string>)>& callback);
 
+  // Implementation of zip::ZipReader::Listener
+  virtual void OnUnzipProgress(int progress) OVERRIDE;
+  virtual void OnUnzipSuccess() OVERRIDE;
+  virtual void OnUnzipFailed() OVERRIDE;
+
   // Runs all cleanup functions.
   void CleanUp();
 
@@ -152,6 +159,9 @@ class Operation
   // memory here.  This requires that we only do one MD5 sum at a time.
   base::MD5Context md5_context_;
 
+  // Zip reader for unzip operations.
+  zip::ZipReader zip_reader_;
+
   // CleanUp operations that must be run.  All these functions are run on the
   // FILE thread.
   std::vector<base::Closure> cleanup_functions_;