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

base/sys_info_android.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 <dlfcn.h>
 #include <sys/system_properties.h>
 
 #include "base/android/sys_utils.h"
@@ skipping 137 matching lines @@
      result = base::SysInfo::AmountOfPhysicalMemoryMB() / 6;
   }
   result = std::min<int64>(std::max<int64>(16 * MB, result), 512 * MB) / MB;
   return static_cast<int>(result);
 }
 
 }  // anonymous namespace
 
 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;
+}
+
 std::string SysInfo::OperatingSystemName() {
   return "Android";
 }
 
 std::string SysInfo::GetAndroidBuildCodename() {
   char os_version_codename_str[PROP_VALUE_MAX];
   __system_property_get("ro.build.version.codename", os_version_codename_str);
   return std::string(os_version_codename_str);
 }
 
@@ skipping 41 matching lines @@
     base::internal::LazySysInfoValue<bool,
         android::SysUtils::IsLowEndDeviceFromJni> >::Leaky
     g_lazy_low_end_device = LAZY_INSTANCE_INITIALIZER;
 
 bool SysInfo::IsLowEndDevice() {
   return g_lazy_low_end_device.Get().value();
 }
 
 
 }  // namespace base