metrics: Add leak detector controller in Chrome OS metrics system

components/metrics/BUILD.gn

Index: components/metrics/BUILD.gn
diff --git a/components/metrics/BUILD.gn b/components/metrics/BUILD.gn
index a83183961f1cd273810becd16394ec9fc2e8730f..59797ecb736360ea5f608c249e8cefe99d8954c8 100644
--- a/components/metrics/BUILD.gn
+++ b/components/metrics/BUILD.gn
@@ -122,6 +122,8 @@ if (is_chromeos) {
       "leak_detector/custom_allocator.h",
       "leak_detector/leak_analyzer.cc",
       "leak_detector/leak_analyzer.h",
+      "leak_detector/leak_detector.cc",
+      "leak_detector/leak_detector.h",
       "leak_detector/leak_detector_impl.cc",
       "leak_detector/leak_detector_impl.h",
       "leak_detector/leak_detector_value_type.cc",
@@ -132,6 +134,7 @@ if (is_chromeos) {
 
     deps = [
       "//base",
+      "//content/public/browser",
     ]
   }
 }
@@ -284,12 +287,14 @@ if (is_chromeos) {
       "leak_detector/call_stack_table_unittest.cc",
       "leak_detector/leak_analyzer_unittest.cc",
       "leak_detector/leak_detector_impl_unittest.cc",
+      "leak_detector/leak_detector_unittest.cc",
       "leak_detector/ranked_list_unittest.cc",
     ]
 
     deps = [
       ":leak_detector",
       "//base",
+      "//content/test:test_support",
       "//testing/gtest",
     ]
   }