Per kmixter's suggestion, install metrics headers under /usr/include/metrics.

src/platform/crash/crash_reporter.cc

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "crash/system_logging.h"
 #include "crash/user_collector.h"
 #include "gflags/gflags.h"
-#include "metrics_library.h"
+#include "metrics/metrics_library.h"
 
 DEFINE_bool(init, false, "Initialize crash logging");
 DEFINE_bool(clean_shutdown, false, "Signal clean shutdown");
 DEFINE_string(exec, "", "Executable name crashed");
 DEFINE_int32(pid, -1, "Crashing PID");
 DEFINE_int32(signal, -1, "Signal causing crash");
 DEFINE_bool(unclean_check, true, "Check for unclean shutdown");
 
 static const char kCrashCounterHistogram[] = "Logging.CrashCounter";
 static const char kUncleanShutdownFile[] =
@@ skipping 84 matching lines @@
 
   // Handle a specific user space crash.
   CHECK(FLAGS_signal != -1) << "Signal must be set";
   CHECK(FLAGS_pid != -1) << "PID must be set";
   CHECK(FLAGS_exec != "") << "Executable name must be set";
 
   user_collector.HandleCrash(FLAGS_signal, FLAGS_pid, FLAGS_exec);
 
   return 0;
 }