Read Chrome build ID and store it in leak reports

chrome/browser/metrics/leak_detector/leak_detector_controller.h

Index: chrome/browser/metrics/leak_detector/leak_detector_controller.h
diff --git a/chrome/browser/metrics/leak_detector/leak_detector_controller.h b/chrome/browser/metrics/leak_detector/leak_detector_controller.h
index 7dabdfb8259e222970705533672bfc965d5f9e96..66006a8b4301ed4644de81b3a394fa0c1531f0b0 100644
--- a/chrome/browser/metrics/leak_detector/leak_detector_controller.h
+++ b/chrome/browser/metrics/leak_detector/leak_detector_controller.h
@@ -5,6 +5,8 @@
 #ifndef CHROME_BROWSER_METRICS_LEAK_DETECTOR_LEAK_DETECTOR_CONTROLLER_H_
 #define CHROME_BROWSER_METRICS_LEAK_DETECTOR_LEAK_DETECTOR_CONTROLLER_H_
 
+#include <stdint.h>
+
 #include <vector>
 
 #include "base/macros.h"
@@ -38,6 +40,9 @@ class LeakDetectorController : public LeakDetector::Observer {
   // protobuf message instead of in separate member variables.
   const MemoryLeakReportProto::Params params_;
 
+  // The build ID of the current Chrome binary.
+  std::vector<uint8_t> build_id_;
+
   // For thread safety.
   base::ThreadChecker thread_checker_;