Read Chrome build ID and store it in leak reports

chrome/browser/metrics/leak_detector/leak_detector_controller.cc

Index: chrome/browser/metrics/leak_detector/leak_detector_controller.cc
diff --git a/chrome/browser/metrics/leak_detector/leak_detector_controller.cc b/chrome/browser/metrics/leak_detector/leak_detector_controller.cc
index a95597b27bd6a824d18e2b1f363ef4749b5184ce..0f26b8cbd34ec73e16fe267604d46516dca3f044 100644
--- a/chrome/browser/metrics/leak_detector/leak_detector_controller.cc
+++ b/chrome/browser/metrics/leak_detector/leak_detector_controller.cc
@@ -8,6 +8,7 @@
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
+#include "components/metrics/leak_detector/gnu_build_id_reader.h"
 #include "components/variations/variations_associated_data.h"
 #include "content/public/browser/browser_thread.h"
 
@@ -90,6 +91,11 @@ MemoryLeakReportProto::Params GetVariationParameters() {
 
 LeakDetectorController::LeakDetectorController()
     : params_(GetVariationParameters()) {
+  // Read the build ID once and store it.
+  leak_detector::GNUBuildIDReader build_id_reader;
+  build_id_reader.ReadBuildID();
+  build_id_ = build_id_reader.build_id();
+
   LeakDetector* detector = LeakDetector::GetInstance();
   detector->AddObserver(this);
 
@@ -111,6 +117,8 @@ void LeakDetectorController::OnLeaksFound(
     // Store the report and insert stored parameters.
     stored_reports_.push_back(report);
     stored_reports_.back().mutable_params()->CopyFrom(params_);
+    stored_reports_.back().mutable_build_id()->assign(build_id_.begin(),
+                                                      build_id_.end());
   }
 }