SimpleCache: synchronously reply on reads from idle if data is in memory.

net/disk_cache/entry_unittest.cc

 // 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.
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/file.h"
 #include "base/files/file_util.h"
@@ skipping 546 matching lines @@
   ret = entry->ReadData(
       1,
       30000,
       buffer2.get(),
       kSize2,
       base::Bind(&CallbackTest::Run, base::Unretained(&callback6)));
   EXPECT_TRUE(5000 == ret || net::ERR_IO_PENDING == ret);
   if (net::ERR_IO_PENDING == ret)
     expected++;
 
-  EXPECT_EQ(0,
-            entry->ReadData(
-                1,
-                35000,
-                buffer2.get(),
-                kSize2,
-                base::Bind(&CallbackTest::Run, base::Unretained(&callback7))));
+  ret = entry->ReadData(
+      1, 35000, buffer2.get(), kSize2,
+      base::Bind(&CallbackTest::Run, base::Unretained(&callback7)));
+  EXPECT_TRUE(0 == ret || net::ERR_IO_PENDING == ret);
+  if (net::ERR_IO_PENDING == ret)
+    expected++;
+
   ret = entry->ReadData(
       1,
       0,
       buffer1.get(),
       kSize1,
       base::Bind(&CallbackTest::Run, base::Unretained(&callback8)));
   EXPECT_TRUE(17000 == ret || net::ERR_IO_PENDING == ret);
   if (net::ERR_IO_PENDING == ret)
     expected++;
   ret = entry->WriteData(
@@ skipping 3701 matching lines @@
   entry->Close();
 
   base::RunLoop().RunUntilIdle();
   disk_cache::SimpleBackendImpl::FlushWorkerPoolForTesting();
   base::RunLoop().RunUntilIdle();
 
   EXPECT_TRUE(
       disk_cache::simple_util::CorruptStream0LengthFromEntry(key, cache_path_));
   EXPECT_NE(net::OK, OpenEntry(key, &entry));
 }