tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 57da90f5dfd22a4ed9af769d7dd0d127eba2bbc3..3faab22ad5178290c30f017097c4636ab0f5d8de 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -52447,6 +52447,21 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Storage.Blob.RendererFileSeekFailed" enum="Boolean">
+  <owner>dmurph@chromium.org</owner>
+  <summary>
+    Recorded when seeking a file to write a part of a blob failed in the

[Mark P, 2016/05/16 23:25:56]

I think you're missing a word in this sentence.  I cannot figure out what it
means.
When revising, please make sure the sentence clearly implies what true and false
means.
Perhaps (after reading the description below) I think you mean "whether" instead
of "when".  But I still don't know what "seeking a file to write a part of ..."
means.   Did you mean:
"Recorded whether seeking within a file (in order to find the place to write a
part of a blob) failed in the renderer."?

[dmurph, 2016/05/17 00:14:44]

Yeah, that sounds a lot better. Thanks!

+    renderer.
+  </summary>
+</histogram>
+
+<histogram name="Storage.Blob.RendererFileWriteFailed" enum="Boolean">
+  <owner>dmurph@chromium.org</owner>
+  <summary>
+    Recorded when writing a part of a blob to a file failed in the renderer.

[Mark P, 2016/05/16 23:25:56]

This description should clearly state what true and false means, not just when
when the histogram is emitted.
Did you mean "whether" instead of "when"?

[dmurph, 2016/05/17 00:14:44]

Yeah. Done.

+  </summary>
+</histogram>
+
 <histogram name="Storage.Blob.ReusedItem" enum="BooleanReused">
   <owner>dmurph@chromium.org</owner>
   <summary>