[sql] Enable HAVE_USLEEP for more platforms.

sql/sqlite_features_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 <string>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "sql/connection.h"
@@ skipping 94 matching lines @@
 
   ASSERT_TRUE(db().Execute("INSERT INTO foo (x) VALUES ('test')"));
 
   sql::Statement s(db().GetUniqueStatement(
       "SELECT x FROM foo WHERE x MATCH 'te*'"));
   ASSERT_TRUE(s.Step());
   EXPECT_EQ("test", s.ColumnString(0));
 }
 #endif
 
+#if !defined(USE_SYSTEM_SQLITE)
+// Verify that Chromium's SQLite is compiled with HAVE_USLEEP defined.  With
+// HAVE_USLEEP, SQLite uses usleep() with millisecond granularity.  Otherwise it
+// uses sleep() with second granularity.
+TEST_F(SQLiteFeaturesTest, UsesUsleep) {
+  base::TimeTicks before = base::TimeTicks::Now();
+  sqlite3_sleep(1);
+  base::TimeDelta delta = base::TimeTicks::Now() - before;
+
+  // It is not impossible for this to be over 1000 if things are compiled the
+  // right way.  But it is very unlikely, most platforms seem to be around
+  // <TBD>.
+  LOG(ERROR) << "Milliseconds: " << delta.InMilliseconds();
+  EXPECT_LT(delta.InMilliseconds(), 1000);
+}
+#endif
+
 }  // namespace