ServiceWorker: Migrate the script cache backend from BlockFile to Simple

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 bbc43543f71fd24af2afaba8febc946d3ef81499..7bdbc37c99437dd666fe093d10281081dde0277b 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -36826,6 +36826,31 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="ServiceWorker.DiskCacheMigrator.MigrationResult"
+    enum="ServiceWorkerStatusCode">
+  <owner>nhiroki@chromium.org</owner>
+  <summary>
+    Records result of ServiceWorkerDiskCache migration from BlockFile to Simple.
+  </summary>
+</histogram>
+
+<histogram name="ServiceWorker.DiskCacheMigrator.MigrationTime"
+    units="millisecond">

[falken, 2015/06/08 09:05:54]

nit: milliseconds

[nhiroki, 2015/06/08 09:29:21]

Fixed (hmmm... I copied this from other SW UMAs... I'll fix them in a separate
CL)

+  <owner>nhiroki@chromium.org</owner>
+  <summary>
+    Execution time of ServiceWorkerDiskCache migration from BlockFile to Simple.
+  </summary>
+</histogram>
+
+<histogram name="ServiceWorker.DiskCacheMigrator.NumberOfMigratedResources"
+    units="count">
+  <owner>nhiroki@chromium.org</owner>
+  <summary>
+    The counts of resources migrated by ServiceWorkerDiskCacheMigrator. This
+    includes the main script and imported scripts.
+  </summary>
+</histogram>
+
 <histogram name="ServiceWorker.FetchEvent.Time" units="milliseconds">
   <owner>shimazu@chromium.org</owner>
   <summary>
@@ -37017,6 +37042,14 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="ServiceWorker.Storage.DiskCacheMigrationResult"
+    enum="ServiceWorkerDiskCacheMigrationResult">
+  <owner>nhiroki@chromium.org</owner>
+  <summary>
+    Records result of diskcache migration operations in ServiceWorkerStorage.
+  </summary>
+</histogram>
+
 <histogram name="ServiceWorker.UnhandledEventRatio" units="percent">
   <owner>kinuko@chromium.org</owner>
   <summary>
@@ -64652,6 +64685,22 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="2" label="Failed to delete ServiceWorkerDiskCache"/>
 </enum>
 
+<enum name="ServiceWorkerDiskCacheMigrationResult" type="int">
+  <int value="0" label="MIGRATION_OK"/>
+  <int value="1" label="MIGRATION_NOT_NECESSARY"/>
+  <int value="2" label="MIGRATION_ERROR_INITIALIZE"/>
+  <int value="3" label="MIGRATION_ERROR_FAILED"/>
+  <int value="4" label="MIGRATION_ERROR_DELETE_DISK_CACHE"/>
+</enum>
+
+<enum name="ServiceWorkerPlatformNotificationStatus" type="int">
+  <int value="0" label="OK"/>
+  <int value="1" label="Service Worker not found"/>
+  <int value="2" label="Service Worker error"/>
+  <int value="3" label="event.waitUntil promise rejected"/>
+  <int value="4" label="Database error"/>
+</enum>
+
 <enum name="ServiceWorkerReadResponseResult" type="int">
   <int value="0" label="OK"/>
   <int value="1" label="Read headers error"/>