Additional metrics for disabled extensions and content verification

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 717ca5d79b8bf96a1be5a04a2709221968515d69..c43d883491bc35a774edd87c06c31591afe18c15 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -6615,6 +6615,31 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Extensions.CorruptExtensionBecameDisabled">
+  <owner>asargent@chromium.org</owner>
+  <summary>
+    Fired each time an extension was detected to be corrupted (contents not
+    matching an expected content hash from the webstore) and was disabled.
+  </summary>
+</histogram>
+
+<histogram name="Extensions.CorruptExtensionTotalDisables">
+  <owner>asargent@chromium.org</owner>
+  <summary>
+    Logged once at startup, this is the value of a counter that is incremented
+    anytime we disable a corrupted extension because its content didn't match an
+    expected content hash.
+  </summary>
+</histogram>
+
+<histogram name="Extensions.CorruptExtensionWouldBeDisabled">
+  <owner>asargent@chromium.org</owner>
+  <summary>
+    Simiar to Extensions.CorruptExtensionBecameDisabled, but fires when we're in
+    a bootstrapping mode and would have disabled an extension.
+  </summary>
+</histogram>
+
 <histogram name="Extensions.CrxFetchError" enum="NetErrorCodes">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>Net error results from URLFetcher.</summary>
@@ -6712,6 +6737,17 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Extensions.DisableReason" enum="ExtensionDisableReason">
+  <owner>asargent@chromium.org</owner>
+  <summary>
+    The count of disabled extensions at startup grouped by disble reason from
+    Extension::DisableReason. When an extension is disabled, it can be for one
+    or more reasons (although typically just one), so the sum of these may be
+    greater than 'Extensions.Disabled' which is a count of the number of unique
+    extensions that are disabled.
+  </summary>
+</histogram>
+
 <histogram name="Extensions.ErrorCodeFromCrxOpen">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
@@ -37934,6 +37970,22 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="2" label="UNINSTALL"/>
 </enum>
 
+<enum name="ExtensionDisableReason" type="int">
+  <int value="0" label="NONE"/>
+  <int value="1" label="USER_ACTION"/>
+  <int value="2" label="PERMISSIONS_INCREASE"/>
+  <int value="4" label="RELOAD"/>
+  <int value="8" label="UNSUPPORTED_REQUIREMENT"/>
+  <int value="16" label="SIDELOAD_WIPEOUT"/>
+  <int value="32" label="UNKNOWN_FROM_SYNC"/>
+  <int value="64" label="DEPRECATED_PERMISSIONS_CONSENT"/>
+  <int value="128" label="DEPRECATED_KNOWN_DISABLED"/>
+  <int value="256" label="NOT_VERIFIED"/>
+  <int value="512" label="GREYLIST"/>
+  <int value="1024" label="CORRUPTED"/>
+  <int value="2048" label="REMOTE_INSTALL"/>
+</enum>
+
 <enum name="ExtensionFileWriteResult" type="int">
   <obsolete>
     Deprecated 10/2013.