Add ProcessMetrics::CreateCurrentProcessMetrics() method.

base/process/process_metrics.cc

Index: base/process/process_metrics.cc
diff --git a/base/process/process_metrics.cc b/base/process/process_metrics.cc
index e48633910763892ea1f64e54a7e0dea9acb1aca1..6d99383cdf69d17c298c21f9dc79f51585c2cd29 100644
--- a/base/process/process_metrics.cc
+++ b/base/process/process_metrics.cc
@@ -43,6 +43,14 @@ scoped_ptr<Value> SystemMetrics::ToValue() const {
   return res.Pass();
 }
 
+ProcessMetrics* ProcessMetrics::CreateCurrentProcessMetrics() {
+#if !defined(OS_MACOSX) || defined(OS_IOS)
+  return CreateProcessMetrics(base::GetCurrentProcessHandle());
+#else
+  return CreateProcessMetrics(base::GetCurrentProcessHandle(), nullptr);
+#endif  // !defined(OS_MACOSX) || defined(OS_IOS)
+}
+
 double ProcessMetrics::GetPlatformIndependentCPUUsage() {
 #if defined(OS_WIN)
   return GetCPUUsage() * processor_count_;