Add a histogram for renderer memory usage.

base/metrics/histogram.h

Index: base/metrics/histogram.h
diff --git a/base/metrics/histogram.h b/base/metrics/histogram.h
index 02a975cfceb995cb325cba66c9a64ed08ce5848d..adb347154e03c08bc54ee2bb9b6bb647eb117e12 100644
--- a/base/metrics/histogram.h
+++ b/base/metrics/histogram.h
@@ -217,6 +217,9 @@ class Lock;
         base::CustomHistogram::FactoryGet(name, custom_ranges, \
                                           base::HistogramBase::kNoFlags))
 
+#define HISTOGRAM_MEMORY_KB(name, sample) HISTOGRAM_CUSTOM_COUNTS( \

[jar (doing other things), 2013/01/14 19:41:18]

Do you deliberately want a histogram that is not going to be uploaded to UMA, as
compared with what is on line 328?

[marja, 2013/01/14 19:42:38]

Yes, we deliberately want that. The histogram is only created if a command line
switch is present, and that switch is only present in tests. So it doesn't make
sense to upload it to UMA.

+    name, sample, 1000, 500000, 50)
+
 //------------------------------------------------------------------------------
 // Define Debug vs non-debug flavors of macros.
 #ifndef NDEBUG