Wire up process launch error codes.

components/metrics/stability_metrics_helper.cc

 // Copyright 2015 The Chromium 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 "components/metrics/stability_metrics_helper.h"
 
 #include <stdint.h>
 
 #include <vector>
 
@@ skipping 179 matching lines @@
     RecordMemoryStats(was_extension_process
                           ? RECORD_MEMORY_STATS_EXTENSIONS_OOM_KILLED
                           : RECORD_MEMORY_STATS_CONTENTS_OOM_KILLED);
 #endif
   } else if (status == base::TERMINATION_STATUS_STILL_RUNNING) {
     UMA_HISTOGRAM_ENUMERATION("BrowserRenderProcessHost.DisconnectedAlive",
                               histogram_type, RENDERER_TYPE_COUNT);
   } else if (status == base::TERMINATION_STATUS_LAUNCH_FAILED) {
     UMA_HISTOGRAM_ENUMERATION("BrowserRenderProcessHost.ChildLaunchFailures",
                               histogram_type, RENDERER_TYPE_COUNT);
+    UMA_HISTOGRAM_SPARSE_SLOWLY(
+        "BrowserRenderProcessHost.ChildLaunchFailureCodes", exit_code);
     if (was_extension_process)
       IncrementPrefValue(prefs::kStabilityExtensionRendererFailedLaunchCount);
     else
       IncrementPrefValue(prefs::kStabilityRendererFailedLaunchCount);
   }
 }
 
 void StabilityMetricsHelper::IncrementPrefValue(const char* path) {
   int value = local_state_->GetInteger(path);
   local_state_->SetInteger(path, value + 1);
 }
 
 void StabilityMetricsHelper::IncrementLongPrefsValue(const char* path) {
   int64_t value = local_state_->GetInt64(path);
   local_state_->SetInt64(path, value + 1);
 }
 
 void StabilityMetricsHelper::LogRendererHang() {
   IncrementPrefValue(prefs::kStabilityRendererHangCount);
 }
 
 }  // namespace metrics