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 4400ab149aff1b051521b1e463b5e4a144f509e0..853064e3540bd1ec075d3950bf10d9c3e35dd6e4 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -52924,6 +52924,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Quota.DaysBetweenRepeatedOriginEvictions">
+  <owner>calamity@chromium.org</owner>
+  <summary>
+    The number of days since an origin was last chosen to be evicted from the
+    storage, recorded each time the origin is evicted (except for the first
+    eviction).
+  </summary>
+</histogram>
+
 <histogram name="Quota.DaysSinceLastAccess" units="days">
   <owner>michaeln@chromium.org</owner>
   <summary>
@@ -52971,12 +52980,21 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Quota.EvictedOriginDaysSinceAccess">
+  <owner>calamity@chromium.org</owner>
+  <summary>
+    The number of days since the evicted origin was last accessed. Logged when
+    the origin  is evicted.
+  </summary>
+</histogram>
+
 <histogram name="Quota.EvictedOriginsPerHour">
   <owner>tzik@chromium.org</owner>
   <summary>Number of evicted origins in an hour.</summary>
 </histogram>
 
 <histogram name="Quota.EvictedOriginTimeSinceAccess">
+  <obsolete/>
   <owner>calamity@chromium.org</owner>
   <summary>
     The time since the evicted origin was last accessed. Logged when the origin
@@ -53062,6 +53080,40 @@ 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.PercentDiskAvailable" units="%">
+  <owner>michaeln@chromium.org</owner>
+  <summary>
+    Percentage of the storage device that is free. Logged at irregular
+    intervals.
+  </summary>
+</histogram>
+
+<histogram name="Quota.PercentUsedByOrigin" units="%">
+  <owner>michaeln@chromium.org</owner>
+  <summary>
+    Percentage of an origin's quota that is being used by the origin. Logged at
+    irregular intervals.
+  </summary>
+</histogram>
+
+<histogram name="Quota.PercentUsedForTemporaryStorage" units="%">
+  <owner>michaeln@chromium.org</owner>
+  <summary>
+    Percentage of the storage device that ia being use for temporary storage.
+    Logged at irregular intervals.
+  </summary>
+</histogram>
+
 <histogram name="Quota.QuotaForOrigin" units="MB">
   <owner>michaeln@chromium.org</owner>
   <summary>
@@ -53080,6 +53132,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Quota.TimeBetweenRepeatedOriginEvictions">
+  <obsolete/>
   <owner>calamity@chromium.org</owner>
   <summary>
     Time since an origin was last chosen to be evicted from the storage,
@@ -53097,7 +53150,18 @@ 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