Add new wired memory metric to memory-infra dumps.

base/process/process_metrics_unittest.cc

Index: base/process/process_metrics_unittest.cc
diff --git a/base/process/process_metrics_unittest.cc b/base/process/process_metrics_unittest.cc
index b11a26b24ba7cfd5417c519dff06257d5b3bb17b..a5754cf18bef7833ed457d343685f8d67c31ac73 100644
--- a/base/process/process_metrics_unittest.cc
+++ b/base/process/process_metrics_unittest.cc
@@ -24,6 +24,10 @@
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/multiprocess_func_list.h"
 
+#if defined(OS_MACOSX)
+#include <sys/mman.h>
+#endif
+
 namespace base {
 namespace debug {
 
@@ -53,6 +57,42 @@ class SystemMetricsTest : public testing::Test {
 
 /////////////////////////////////////////////////////////////////////////////
 
+#if defined(OS_MACOSX) && !defined(OS_IOS) && !defined(ADDRESS_SANITIZER)
+TEST_F(SystemMetricsTest, LockedBytes) {
+  ProcessHandle handle = GetCurrentProcessHandle();
+  std::unique_ptr<ProcessMetrics> metrics(
+      ProcessMetrics::CreateProcessMetrics(handle, nullptr));
+
+  size_t initial_locked_bytes;
+  bool result =
+      metrics->GetMemoryBytes(nullptr, nullptr, nullptr, &initial_locked_bytes);
+  ASSERT_TRUE(result);
+
+  size_t size = 8 * 1024 * 1024;
+  std::unique_ptr<char[]> memory(new char[size]);
+  int r = mlock(memory.get(), size);
+  ASSERT_EQ(0, r);
+
+  size_t new_locked_bytes;
+  result =
+      metrics->GetMemoryBytes(nullptr, nullptr, nullptr, &new_locked_bytes);
+  ASSERT_TRUE(result);
+
+  // There should be around |size| more locked bytes, but multi-threading might
+  // cause noise.
+  EXPECT_LT(initial_locked_bytes + size / 2, new_locked_bytes);
+  EXPECT_GT(initial_locked_bytes + size * 1.5, new_locked_bytes);
+
+  r = munlock(memory.get(), size);
+  ASSERT_EQ(0, r);
+
+  result =
+      metrics->GetMemoryBytes(nullptr, nullptr, nullptr, &new_locked_bytes);
+  ASSERT_TRUE(result);
+  EXPECT_EQ(initial_locked_bytes, new_locked_bytes);
+}
+#endif  // defined(OS_MACOSX) && !defined(OS_IOS) && !defined(ADDRESS_SANITIZER)
+
 #if defined(OS_LINUX) || defined(OS_ANDROID)
 TEST_F(SystemMetricsTest, IsValidDiskName) {
   std::string invalid_input1 = "";