Implementation of leveldb-backed PrefStore

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 958ecc96c492a8f18ba4d717a5afe10f57c6acbe..9ff4f67b11cb3c5e635a4cab10614f81bdcd2a10 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -9056,6 +9056,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="LevelDBPrefStore.ReadErrors" enum="LevelDBPrefStoreErrorCodes">
+  <owner>dgrogan@chromium.org</owner>
+  <summary>
+    Bitfield that indicates errors and recovery that occurred when opening a
+    LevelDB preferences database.
+  </summary>
+</histogram>
+
 <histogram name="LibraryLoader.NativeLibraryHack" enum="BooleanUsage">
   <owner>feng@chromium.org</owner>
   <summary>
@@ -37534,6 +37542,36 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="20" label="GetChildren"/>
 </enum>
 
+<enum name="LevelDBPrefStoreErrorCodes" type="int">
+  <int value="1" label="OPENED"/>
+  <int value="5" label="REPAIRED | OPENED"/>
+  <int value="6" label="REPAIRED | DESTROYED"/>
+  <int value="7" label="REPAIRED | DESTROYED | OPENED"/>
+  <int value="12" label="REPAIRED | DESTROY_FAILED"/>
+  <int value="18" label="REPAIR_FAILED | DESTROYED"/>
+  <int value="19" label="REPAIR_FAILED | DESTROYED | OPENED"/>
+  <int value="24" label="REPAIR_FAILED | DESTROY_FAILED"/>
+  <int value="32" label="IO_ERROR"/>
+  <int value="36" label="REPAIRED | IO_ERROR"/>
+  <int value="38" label="REPAIRED | DESTROYED | IO_ERROR"/>
+  <int value="50" label="REPAIR_FAILED | DESTROYED | IO_ERROR"/>
+  <int value="65" label="OPENED | DATA_LOST"/>
+  <int value="69" label="REPAIRED | OPENED | DATA_LOST"/>
+  <int value="71" label="REPAIRED | DESTROYED | OPENED | DATA_LOST"/>
+  <int value="83" label="REPAIR_FAILED | DESTROYED | OPENED | DATA_LOST"/>
+  <int value="129" label="OPENED | ITER_NOT_OK"/>
+  <int value="133" label="REPAIRED | OPENED | ITER_NOT_OK"/>
+  <int value="135" label="REPAIRED | DESTROYED | OPENED | ITER_NOT_OK"/>
+  <int value="147" label="REPAIR_FAILED | DESTROYED | OPENED | ITER_NOT_OK"/>
+  <int value="193" label="OPENED | DATA_LOST | ITER_NOT_OK"/>
+  <int value="197" label="REPAIRED | OPENED | DATA_LOST | ITER_NOT_OK"/>
+  <int value="199"
+      label="REPAIRED | DESTROYED | OPENED | DATA_LOST | ITER_NOT_OK"/>
+  <int value="211"
+      label="REPAIR_FAILED | DESTROYED | OPENED | DATA_LOST | ITER_NOT_OK"/>
+  <int value="256" label="FILE_NOT_SPECIFIED"/>
+</enum>
+
 <enum name="LinkMonitorFailureType" type="int">
   <int value="0" label="Local MAC Address Not Found"/>
   <int value="1" label="Client Startup Failure"/>