Add new memory histograms which fix inprecise bucketing.

chrome/browser/metrics/metrics_memory_details.cc

Index: chrome/browser/metrics/metrics_memory_details.cc
diff --git a/chrome/browser/metrics/metrics_memory_details.cc b/chrome/browser/metrics/metrics_memory_details.cc
index 69b343240dfbdabddcbae2da0f903e47ea22a949..2d830492d47d947b82db355821e5e4d0fbdbe10b 100644
--- a/chrome/browser/metrics/metrics_memory_details.cc
+++ b/chrome/browser/metrics/metrics_memory_details.cc
@@ -195,8 +195,11 @@ void MetricsMemoryDetails::UpdateHistograms() {
   // TODO(viettrungluu): Do we want separate counts for the other
   // (platform-specific) process types?
 
-  int total_sample = static_cast<int>(aggregate_memory / 1000);
-  UMA_HISTOGRAM_MEMORY_MB("Memory.Total", total_sample);
+  // TODO(rkaplow): Remove once we've verified Memory.Total2 is ok.
+  int total_sample_old = static_cast<int>(aggregate_memory / 1000);
+  UMA_HISTOGRAM_MEMORY_MB("Memory.Total", total_sample_old);
+  int total_sample = static_cast<int>(aggregate_memory / 1024);
+  UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Total2", total_sample);
 
 #if defined(OS_CHROMEOS)
   UpdateSwapHistograms();
@@ -272,8 +275,11 @@ void MetricsMemoryDetails::UpdateSwapHistograms() {
     }
   }
 
-  int total_sample = static_cast<int>(aggregate_memory / 1000);
-  UMA_HISTOGRAM_MEMORY_MB("Memory.Swap.Total", total_sample);
+  // TODO(rkaplow): Remove once we've verified Memory.Swap.Total2 is ok.
+  int total_sample_old = static_cast<int>(aggregate_memory / 1000);
+  UMA_HISTOGRAM_MEMORY_MB("Memory.Swap.Total", total_sample_old);
+  int total_sample = static_cast<int>(aggregate_memory / 1024);
+  UMA_HISTOGRAM_MEMORY_LARGE_MB("Memory.Swap.Total2", total_sample);
 
   UMA_HISTOGRAM_CUSTOM_COUNTS("Memory.Swap.CompressedDataSize",
                               swap_info().compr_data_size / (1024 * 1024), 1,