Add ProcessMetrics::CreateCurrentProcessMetrics() method.

base/process/process_metrics.h

Index: base/process/process_metrics.h
diff --git a/base/process/process_metrics.h b/base/process/process_metrics.h
index 327483a42e7ea1f426f407a2bfc9cddfad92a0f2..40c9644824b5967fb24e152a5a030ebc915f1f3a 100644
--- a/base/process/process_metrics.h
+++ b/base/process/process_metrics.h
@@ -90,8 +90,9 @@ struct CommittedKBytes {
 BASE_EXPORT int64 TimeValToMicroseconds(const struct timeval& tv);
 
 // Provides performance metrics for a specified process (CPU usage, memory and
-// IO counters). To use it, invoke CreateProcessMetrics() to get an instance
-// for a specific process, then access the information with the different get
+// IO counters). Use CreateCurrentProcessMetrics() to get an instance for the
+// current process, or CreateProcessMetrics() to get an instance for an
+// arbitrary process. Then, access the information with the different get
 // methods.
 class BASE_EXPORT ProcessMetrics {
  public:
@@ -110,6 +111,11 @@ class BASE_EXPORT ProcessMetrics {
                                               PortProvider* port_provider);
 #endif  // !defined(OS_MACOSX) || defined(OS_IOS)
 
+  // Creates a ProcessMetrics for the current process. This a cross-platform
+  // convenience wrapper for CreateProcessMetrics().
+  // The caller owns the returned object.
+  static ProcessMetrics* CreateCurrentProcessMetrics();
+
   // 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
   // memory size.