components/metrics: Add runtime memory leak detector

components/metrics/BUILD.gn

Index: components/metrics/BUILD.gn
diff --git a/components/metrics/BUILD.gn b/components/metrics/BUILD.gn
index 836c2431743ba5ddddb011e770022496e5f2880f..f711a59b56571968d4e2746556081ff64cfd6e2c 100644
--- a/components/metrics/BUILD.gn
+++ b/components/metrics/BUILD.gn
@@ -111,6 +111,30 @@ if (!is_ios) {
   }
 }
 
+# GYP version: components/metrics.gypi:metrics_leak_detector
+static_library("leak_detector") {
+  sources = [
+    "leak_detector/call_stack_manager.cc",
+    "leak_detector/call_stack_manager.h",
+    "leak_detector/call_stack_table.cc",
+    "leak_detector/call_stack_table.h",
+    "leak_detector/custom_allocator.cc",
+    "leak_detector/custom_allocator.h",
+    "leak_detector/leak_analyzer.cc",
+    "leak_detector/leak_analyzer.h",
+    "leak_detector/leak_detector_impl.cc",
+    "leak_detector/leak_detector_impl.h",
+    "leak_detector/leak_detector_value_type.cc",
+    "leak_detector/leak_detector_value_type.h",
+    "leak_detector/ranked_list.cc",
+    "leak_detector/ranked_list.h",
+  ]
+
+  deps = [
+    "//base",
+  ]
+}
+
 # GYP version: components/metrics.gypi:metrics_net
 static_library("net") {
   sources = [
@@ -241,6 +265,22 @@ if (is_linux) {
   }
 }
 
+source_set("leak_detector_unit_tests") {
+  testonly = true
+  sources = [
+    "leak_detector/call_stack_manager_unittest.cc",
+    "leak_detector/call_stack_table_unittest.cc",
+    "leak_detector/leak_analyzer_unittest.cc",
+    "leak_detector/leak_detector_impl_unittest.cc",
+    "leak_detector/ranked_list_unittest.cc",
+  ]
+
+  deps = [
+    ":leak_detector",
+    "//testing/gtest",
+  ]
+}
+
 source_set("unit_tests") {
   testonly = true
   sources = [
@@ -280,5 +320,9 @@ source_set("unit_tests") {
     sources += [ "serialization/serialization_utils_unittest.cc" ]
     deps += [ ":serialization" ]
   }
+
+  if (is_chromeos) {
+    deps += [ ":leak_detector_unit_tests" ]
+  }
 }
 # TODO(GYP): metrics_chromeos