[NOT TO COMMIT YET] Using proc/pid/status file contents to get process metrics in linux.

base/process/process_metrics.h

 // Copyright (c) 2013 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.
 
 // This file contains routines for gathering resource statistics for processes
 // running on the system.
 
 #ifndef BASE_PROCESS_PROCESS_METRICS_H_
 #define BASE_PROCESS_PROCESS_METRICS_H_
 
@@ skipping 289 matching lines @@
 
 #endif  // defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX) ||
         // defined(OS_ANDROID)
 
 #if defined(OS_LINUX) || defined(OS_ANDROID)
 // Parse the data found in /proc/<pid>/stat and return the sum of the
 // CPU-related ticks.  Returns -1 on parse error.
 // Exposed for testing.
 BASE_EXPORT int ParseProcStatCPU(const std::string& input);
 
+// Parses the /proc/<pid>/status file contents passed and sets |value| to the
+// size in bytes corresponding to the |field|. Only works for fields in the form
+// of "Field: value kB". Returns true on success.
+BASE_EXPORT bool ParseProcStatusAndGetField(
+    const base::StringPiece& proc_status_contents,
+    const std::string& field,
+    size_t* value);
+
 // Get the number of threads of |process| as available in /proc/<pid>/stat.
 // This should be used with care as no synchronization with running threads is
 // done. This is mostly useful to guarantee being single-threaded.
 // Returns 0 on failure.
 BASE_EXPORT int GetNumberOfThreads(ProcessHandle process);
 
 // /proc/self/exe refers to the current executable.
 BASE_EXPORT extern const char kProcSelfExe[];
 
 // Parses a string containing the contents of /proc/meminfo
@@ skipping 83 matching lines @@
   SystemDiskInfo disk_info_;
 #endif
 #if defined(OS_CHROMEOS)
   SwapInfo swap_info_;
 #endif
 };
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_PROCESS_METRICS_H_