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 553 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 3936 matching lines @@
 
   // Stream 0 has CRC, stream 1 doesn't.
   histogram_tester.ExpectBucketCount("SimpleCache.Http.SyncCheckEOFHasCrc",
                                      true, 1);
   histogram_tester.ExpectBucketCount("SimpleCache.Http.SyncCheckEOFHasCrc",
                                      false, 1);
   // EOF check is recorded even if there is no CRC there.
   histogram_tester.ExpectUniqueSample("SimpleCache.Http.SyncCheckEOFResult",
                                       disk_cache::CHECK_EOF_RESULT_SUCCESS, 2);
 }