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

base/sys_info_linux.cc

 // Copyright (c) 2011 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 <limits>
 
 #include "base/files/file_util.h"
 #include "base/lazy_instance.h"
@@ skipping 50 matching lines @@
 // static
 int64 SysInfo::AmountOfAvailablePhysicalMemory() {
   return AmountOfMemory(_SC_AVPHYS_PAGES);
 }
 
 // static
 int64 SysInfo::AmountOfPhysicalMemory() {
   return g_lazy_physical_memory.Get().value();
 }
 
+#if !defined(OS_CHROMEOS) && !defined(OS_ANDROID)
+bool SysInfo::HasSeekPenalty(const FilePath& path, bool* has_seek_penalty) {
+  // TODO(dbeam): implement.
+  return false;
+}
+#endif
+
 // static
 size_t SysInfo::MaxSharedMemorySize() {
   return g_lazy_max_shared_memory.Get().value();
 }
 
 // static
 std::string SysInfo::CPUModelName() {
 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
   const char kCpuModelPrefix[] = "Hardware";
 #else
   const char kCpuModelPrefix[] = "model name";
 #endif
   std::string contents;
   ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
   DCHECK(!contents.empty());
   if (!contents.empty()) {
     std::istringstream iss(contents);
     std::string line;
     while (std::getline(iss, line)) {
       if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
         size_t pos = line.find(": ");
         return line.substr(pos + 2);
       }
     }
   }
   return std::string();
 }
 
 }  // namespace base