Disk cache: First pass to add support for sparse entries....

net/disk_cache/disk_cache_test_util.h

Index: net/disk_cache/disk_cache_test_util.h
===================================================================
--- net/disk_cache/disk_cache_test_util.h	(revision 18456)
+++ net/disk_cache/disk_cache_test_util.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2006-2009 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.
 
@@ -11,6 +11,7 @@
 #include "base/message_loop.h"
 #include "base/task.h"
 #include "base/timer.h"
+#include "net/base/test_completion_callback.h"
 
 // Re-creates a given test file inside the cache test folder.
 bool CreateCacheTestFile(const wchar_t* name);
@@ -53,7 +54,8 @@
 
 // -----------------------------------------------------------------------
 
-// Simple callback to process IO completions from the cache.
+// Simple callback to process IO completions from the cache. It allows tests
+// with multiple simultaneous IO operations.
 class CallbackTest : public CallbackRunner< Tuple1<int> >  {
  public:
   explicit CallbackTest(bool reuse) : result_(-1), reuse_(reuse ? 0 : 1) {}
@@ -70,6 +72,24 @@
 
 // -----------------------------------------------------------------------
 
+// Simple callback to process IO completions from the cache. This object is not
+// intended to be used when multiple IO operations are in-flight at the same
+// time.
+class SimpleCallbackTest : public TestCompletionCallback  {
+ public:
+  SimpleCallbackTest() {}
+  ~SimpleCallbackTest() {}
+
+  // Returns the final result of the IO operation. If |result| is
+  // net::ERR_IO_PENDING, it waits for the callback be invoked.
+  int GetResult(int result);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SimpleCallbackTest);
+};
+
+// -----------------------------------------------------------------------
+
 // Simple helper to deal with the message loop on a test.
 class MessageLoopHelper {
  public: