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 eb6bfcffcc9a4d906377862b5a0009de9715ef3a..d85efdb7d9040da0cf8a2f04a33c019fb223f410 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -9905,6 +9905,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="InputMethod.AutoCorrectLevel">
+  <owner>shuchen@chromium.org</owner>
+  <summary>
+    The auto-correction level for suggestion engine. For now, it has the range
+    from 0 to 2.

[Ilya Sherman, 2014/09/25 22:25:34]

Are there any meaningful labels that could be provided as an enum to clarify the
meaning of this?

[Shu Chen, 2014/09/26 14:22:05]

Done.

+  </summary>
+</histogram>
+
 <histogram name="InputMethod.Category" enum="InputMethodCategory">
   <owner>shuchen@chromium.org</owner>
   <summary>
@@ -9939,6 +9947,24 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="InputMethod.VirtualKeyboard.BackspaceCount">
+  <owner>shuchen@chromium.org</owner>
+  <summary>
+    The backspace count on virtual keyboard while virtual keyboard is alive.

[Ilya Sherman, 2014/09/25 22:25:34]

Optional nit: Perhaps rephrase as something like "The number of times the
backspace key was pressed on the virtual keyboard, while the virtual keyboard
was alive. Recorded when the virtual keyboard is closed or otherwise destroyed."

[Shu Chen, 2014/09/26 14:22:05]

Done.

+  </summary>
+</histogram>
+
+<histogram name="InputMethod.VirtualKeyboard.BackspaceOnLayout"
+    enum="IMEVKLayout">
+  <owner>shuchen@chromium.org</owner>
+  <summary>The layout type recorded when backspace happens.</summary>

[Ilya Sherman, 2014/09/25 22:25:34]

Optional nit: Perhaps rephrase as something like "The layout type of the virtual
keyboard, recorded when backspace is pressed."

[Shu Chen, 2014/09/26 14:22:05]

Done.

+</histogram>
+
+<histogram name="InputMethod.VirtualKeyboard.Duration">

[Ilya Sherman, 2014/09/25 22:25:34]

nit: Please add a units attribute for this histogram.

[Shu Chen, 2014/09/26 14:22:05]

Done.

+  <owner>shuchen@chromium.org</owner>
+  <summary>The virtual keyboard alive duration in seconds.</summary>

[Ilya Sherman, 2014/09/25 22:25:34]

nit: Perhaps rephrase as something like "How long the virtual keyboard was
alive." or (if it's accurate) "visible"/"in use"/"active" in place of "alive". 
If you prefer "Duration" in place of "How long", that's fine: "The duration for
which ...".

[Shu Chen, 2014/09/26 14:22:05]

Done.

+</histogram>
+
 <histogram name="InputMethod.VirtualKeyboard.InitLatency" units="milliseconds">
   <owner>shuchen@chromium.org</owner>
   <summary>