Add minimal support for process_utils on iOS

base/process_util.h

Index: base/process_util.h
diff --git a/base/process_util.h b/base/process_util.h
index ae5c9945f8f35a5212048acec8fb17db84636ee3..eba109bf6bf90015d1251a433c71e09e2d70c60e 100644
--- a/base/process_util.h
+++ b/base/process_util.h
@@ -699,7 +699,7 @@ class BASE_EXPORT ProcessMetrics {
 
   // Creates a ProcessMetrics for the specified process.
   // The caller owns the returned object.
-#if !defined(OS_MACOSX)
+#if !defined(OS_MACOSX) || defined(OS_IOS)
   static ProcessMetrics* CreateProcessMetrics(ProcessHandle process);
 #else
   class PortProvider {
@@ -716,7 +716,7 @@ class BASE_EXPORT ProcessMetrics {
   // only returns valid metrics if |process| is the current process.
   static ProcessMetrics* CreateProcessMetrics(ProcessHandle process,
                                               PortProvider* port_provider);
-#endif  // !defined(OS_MACOSX)
+#endif  // !defined(OS_MACOSX) || defined(OS_IOS)
 
   // Returns the current space allocated for the pagefile, in bytes (these pages
   // may or may not be in memory).  On Linux, this returns the total virtual
@@ -764,11 +764,11 @@ class BASE_EXPORT ProcessMetrics {
   bool GetIOCounters(IoCounters* io_counters) const;
 
  private:
-#if !defined(OS_MACOSX)
+#if !defined(OS_MACOSX) || defined(OS_IOS)
   explicit ProcessMetrics(ProcessHandle process);
 #else
   ProcessMetrics(ProcessHandle process, PortProvider* port_provider);
-#endif  // defined(OS_MACOSX)
+#endif  // !defined(OS_MACOSX) || defined(OS_IOS)
 
   ProcessHandle process_;
 
@@ -779,6 +779,7 @@ class BASE_EXPORT ProcessMetrics {
   int64 last_time_;
   int64 last_system_time_;
 
+#if !defined(OS_IOS)
 #if defined(OS_MACOSX)
   // Queries the port provider if it's set.
   mach_port_t TaskForPid(ProcessHandle process) const;
@@ -788,6 +789,7 @@ class BASE_EXPORT ProcessMetrics {
   // Jiffie count at the last_time_ we updated.
   int last_cpu_;
 #endif  // defined(OS_POSIX)
+#endif  // !defined(OS_IOS)
 
   DISALLOW_COPY_AND_ASSIGN(ProcessMetrics);
 };