metrics: Add leak detector controller in Chrome OS metrics system

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 47f1ce028068b6598b3d4e305cd1e3be56a058fa..b18cdc6fc4541ef610729c9e2c4c84d7afedbd0a 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -7,6 +7,7 @@ import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
+import("//components/metrics/leak_detector/leak_detector.gni")
 import("//media/media_options.gni")
 import("//third_party/protobuf/proto_library.gni")
 
@@ -132,6 +133,7 @@ source_set("browser") {
     "//components/infobars/core",
     "//components/invalidation/impl",
     "//components/metrics:gpu",
+    "//components/metrics:metrics_flags",
     "//components/metrics:net",
     "//components/metrics:profiler",
     "//components/metrics:profiler_content",
@@ -596,6 +598,14 @@ source_set("browser") {
     ]
   }
 
+  if (is_chromeos && enable_leak_detector) {
+    sources += [
+      "metrics/leak_detector_controller.cc",
+      "metrics/leak_detector_controller.h",
+    ]
+    deps += [ "//components/metrics:leak_detector" ]
+  }
+
   if (use_cups) {
     configs += [ "//printing:cups" ]
   }