Keep histogram and bucket-ranges info in minidumps.

base/metrics/histogram_snapshot_manager.cc

Index: base/metrics/histogram_snapshot_manager.cc
diff --git a/base/metrics/histogram_snapshot_manager.cc b/base/metrics/histogram_snapshot_manager.cc
index 930fa0941efc9aab609dba80d620cdd8102e35f7..e21d512daba271dc43248a9e63b598ce98d55472 100644
--- a/base/metrics/histogram_snapshot_manager.cc
+++ b/base/metrics/histogram_snapshot_manager.cc
@@ -6,6 +6,7 @@
 
 #include <memory>
 
+#include "base/debug/alias.h"
 #include "base/metrics/histogram_flattener.h"
 #include "base/metrics/histogram_samples.h"
 #include "base/metrics/statistics_recorder.h"
@@ -118,6 +119,10 @@ void HistogramSnapshotManager::PrepareSamples(
     // The checksum should have caught this, so crash separately if it didn't.
     CHECK_NE(0U, HistogramBase::RANGE_CHECKSUM_ERROR & corruption);
     CHECK(false);  // Crash for the bucket order corruption.
+    // Ensure that compiler keeps around pointers to |histogram| and its
+    // internal |bucket_ranges_| for any minidumps.
+    base::debug::Alias(
+        static_cast<const Histogram*>(histogram)->bucket_ranges());
   }
   // Checksum corruption might not have caused order corruption.
   CHECK_EQ(0U, HistogramBase::RANGE_CHECKSUM_ERROR & corruption);