[DOMStorage] Rate limiting writes to disk.

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 3c6996aac71069b7fb6b3be89f42ad48e4e9c4a8..323490bb70bfc959b2642497d30026e56699ee40 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -5593,6 +5593,9 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="DOMStorage.clear" units="milliseconds">
+  <obsolete>
+    Deprecated 2012.
+  </obsolete>
   <owner>michaeln@chromium.org</owner>
   <summary>
     Duration to execute localStorage.clear() or sessionStorage.clear().
@@ -5600,6 +5603,9 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="DOMStorage.getItem" units="milliseconds">
+  <obsolete>
+    Deprecated 2012.
+  </obsolete>
   <owner>michaeln@chromium.org</owner>
   <summary>
     Duration to execute localStorage.getItem() or sessionStorage.getItem().
@@ -5607,6 +5613,9 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="DOMStorage.key" units="milliseconds">
+  <obsolete>
+    Deprecated 2012.
+  </obsolete>
   <owner>michaeln@chromium.org</owner>
   <summary>
     Duration to execute localStorage.key() or sessionStorage.key().
@@ -5614,6 +5623,9 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="DOMStorage.length" units="milliseconds">
+  <obsolete>
+    Deprecated 2012.
+  </obsolete>
   <owner>michaeln@chromium.org</owner>
   <summary>
     Duration to execute localStorage.length() or sessionStorage.length().
@@ -5621,6 +5633,9 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="DOMStorage.removeItem" units="milliseconds">
+  <obsolete>
+    Deprecated 2012.
+  </obsolete>
   <owner>michaeln@chromium.org</owner>
   <summary>
     Duration to execute localStorage.removeItem() or
@@ -5629,6 +5644,9 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 </histogram>
 
 <histogram name="DOMStorage.setItem" units="milliseconds">
+  <obsolete>
+    Deprecated 2012.
+  </obsolete>
   <owner>michaeln@chromium.org</owner>
   <summary>
     Duration to execute localStorage.setItem() or sessionStorage.setItem().
@@ -12414,6 +12432,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="LocalStorage.CommitDelay">
+  <owner>michaeln@chromium.org</owner>
+  <summary>
+    Delay between a page making changes and those changes being written to the
+    DB.
+  </summary>
+</histogram>
+
 <histogram name="LocalStorage.RendererLocalStorageSizeInKB" units="KB">
   <owner>michaeln@chromium.org</owner>
   <summary>