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 7e45fe121d9959baed490d9c6842b91605d3026f..c59463a0f5be53e900aa07b16ccd38f93eb61dc9 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;
 
@@ -37,8 +38,7 @@ class OperationManager;
 // Run, Complete.  Start and Complete run on the UI thread and are responsible
 // 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> {
+class Operation : public base::RefCountedThreadSafe<Operation> {
  public:
   typedef base::Callback<void(bool, const std::string&)> StartWriteCallback;
   typedef base::Callback<void(bool, const std::string&)> CancelWriteCallback;
@@ -140,6 +140,7 @@ 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,
@@ -147,6 +148,11 @@ class Operation
                 int progress_scale,
                 const base::Callback<void(scoped_ptr<std::string>)>& callback);
 
+  // Callbacks for zip::ZipReader.
+  void OnUnzipSuccess();
+  void OnUnzipFailure();
+  void OnUnzipProgress(int64 total_bytes, int64 progress_bytes);
+
   // Runs all cleanup functions.
   void CleanUp();
 
@@ -159,6 +165,9 @@ 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_;