base: "implement" seek time detection for iOS/Android and add more stubs.

base/sys_info_mac.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 "base/sys_info.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 #include <CoreServices/CoreServices.h>
 #include <mach/mach_host.h>
 #include <mach/mach_init.h>
@@ skipping 58 matching lines @@
                       reinterpret_cast<host_info_t>(&vm_info),
                       &count) != KERN_SUCCESS) {
     NOTREACHED();
     return 0;
   }
 
   return static_cast<int64>(
       vm_info.free_count - vm_info.speculative_count) * PAGE_SIZE;
 }
 
+bool SysInfo::HasSeekPenalty(const FilePath& path, bool* has_seek_penalty) {
+  // TODO(dbeam): implement.
+  return false;
+}
+
 // static
 std::string SysInfo::CPUModelName() {
   char name[256];
   size_t len = arraysize(name);
   if (sysctlbyname("machdep.cpu.brand_string", &name, &len, NULL, 0) == 0)
     return name;
   return std::string();
 }
 
 std::string SysInfo::HardwareModelName() {
   char model[256];
   size_t len = sizeof(model);
   if (sysctlbyname("hw.model", model, &len, NULL, 0) == 0)
     return std::string(model, 0, len);
   return std::string();
 }
 
 }  // namespace base