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

base/sys_info_ios.mm

 // 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"
 
 #import <UIKit/UIKit.h>
 #include <mach/mach.h>
 #include <sys/sysctl.h>
 #include <sys/types.h>
 
 #include "base/logging.h"
 #include "base/mac/scoped_mach_port.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/strings/sys_string_conversions.h"
 
 namespace base {
 
+bool SysInfo::HasSeekPenalty(const FilePath& path, bool* has_seek_penalty) {
+  // Find a case where this is incorrect and dbeam@ will buy you a beer.
+  *has_seek_penalty = false;
+  return true;
+}
+
 // static
 std::string SysInfo::OperatingSystemName() {
   static dispatch_once_t get_system_name_once;
   static std::string* system_name;
   dispatch_once(&get_system_name_once, ^{
       base::mac::ScopedNSAutoreleasePool pool;
       system_name = new std::string(
           SysNSStringToUTF8([[UIDevice currentDevice] systemName]));
   });
   // Examples of returned value: 'iPhone OS' on iPad 5.1.1
@@ skipping 69 matching lines @@
 // 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();
 }
 
 }  // namespace base