Change how the quota system computes the total poolsize for temporary storage

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 65ac7a77a2dba05bc05e1528c35b511ba1cd31d1..173e327ace9a074672e71c82b89eab43cf2dbe12 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -50944,6 +50944,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Number of unlimited origins using temporary storage.</summary>
 </histogram>
 
+<histogram name="Quota.OSAccomodationDelta" units="MB">
+  <owner>michaeln@chromium.org</owner>
+  <summary>
+    If our hardcoded OS accomodation is too large for the volume size, we define
+    the value as a fraction of the total volume size instead. The
+    OSAccomodationDelta is the difference between the hardcoded and computed
+    values.
+  </summary>
+</histogram>
+
 <histogram name="Quota.QuotaForOrigin" units="MB">
   <owner>michaeln@chromium.org</owner>
   <summary>
@@ -50979,7 +50989,18 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Time spent to an eviction round.</summary>
 </histogram>
 
+<histogram name="Quota.TimeToGetSettings" units="ms">
+  <owner>michaeln@chromium.org</owner>
+  <summary>
+    Time spent querying the embedder for the settings values. Logged at
+    irregular intervals as the values are refreshed.
+  </summary>
+</histogram>
+
 <histogram name="Quota.TimeToInitializeGlobalQuota" units="ms">
+  <obsolete>
+    Removed November 2016
+  </obsolete>
   <owner>michaeln@chromium.org</owner>
   <summary>
     Time spent initializing the global quota. Logged when the storage