Implement the inert attribute

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 82b7e74c3e184504005a7f67cf59a9f8b5a6f047..4401cf81aee4298ad3bffba87d18c5a7b5c97dad 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -19833,21 +19833,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="GeolocationDisclosure.PostDisclosureContentSetting"
-    enum="ContentSetting">
-  <owner>benwells@chromium.org</owner>
-  <summary>
-    Records the geolocation content setting for the default search engine's
-    origin after the search geolocation disclosure has been shown and won't be
-    shown again. This metric is only recorded once per client.
-  </summary>
-</histogram>
-
 <histogram name="GeolocationDisclosure.PostDisclosurePermission"
     enum="PermissionStatus">
-  <obsolete>
-    Deprecated 2017/01. Replaced by PostDisclosureContentSetting.
-  </obsolete>
   <owner>benwells@chromium.org</owner>
   <summary>
     Records the geolocation permission for the default search engine's origin
@@ -19856,21 +19843,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="GeolocationDisclosure.PreDisclosureContentSetting"
-    enum="ContentSetting">
-  <owner>benwells@chromium.org</owner>
-  <summary>
-    Records the geolocation content setting for the default search engine's
-    origin immediately before the search geolocation disclosure has been shown.
-    This metric is only recorded once per client.
-  </summary>
-</histogram>
-
 <histogram name="GeolocationDisclosure.PreDisclosurePermission"
     enum="PermissionStatus">
-  <obsolete>
-    Deprecated 2017/01. Replaced by PreDisclosureContentSetting.
-  </obsolete>
   <owner>benwells@chromium.org</owner>
   <summary>
     Records the geolocation permission for the default search engine's origin
@@ -28951,15 +28925,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>The scheme of the URL for each main-frame navigation.</summary>
 </histogram>
 
-<histogram name="Navigation.MainFrameScheme.DataUrl.MimeType"
-    enum="DataUrlMimeType">
-  <owner>meacer@chromium.org</owner>
-  <summary>
-    The mime type of the data: URL for each main-frame navigation. This only
-    contains mime types that can run scripts.
-  </summary>
-</histogram>
-
 <histogram name="Navigation.MainFrameSchemeDifferentPage"
     enum="NavigationScheme">
   <owner>cbentzel@chromium.org</owner>
@@ -38936,36 +38901,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="NewTabPage.ContentSuggestions.Notifications.Actions"
-    enum="ContentSuggestionsNotificationsAction">
-  <owner>sfiera@chromium.org</owner>
-  <summary>
-    Android: The number of actions taken on displayed notifications, either
-    user-initiated (tapping to open or swiping to dismiss), or automatic (hiding
-    due to a change in circumstances).
-  </summary>
-</histogram>
-
-<histogram name="NewTabPage.ContentSuggestions.Notifications.Impressions"
-    enum="ContentSuggestionsNotificationsImpression">
-  <owner>sfiera@chromium.org</owner>
-  <summary>
-    Android: The number of notifications that were shown, keyed by category. One
-    bucket counts the server-provided ARTICLES category; the other counts
-    everything else.
-  </summary>
-</histogram>
-
-<histogram name="NewTabPage.ContentSuggestions.Notifications.OptOuts"
-    enum="ContentSuggestionsNotificationsOptOut">
-  <owner>sfiera@chromium.org</owner>
-  <summary>
-    Android: The number of times a user opted out, keyed by method: IMPLICIT
-    (user ignored enough notifications consecutively that we think they're not
-    interested), or EXPLICIT (via explicit setting).
-  </summary>
-</histogram>
-
 <histogram name="NewTabPage.ContentSuggestions.OpenDisposition"
     enum="WindowOpenDisposition">
   <owner>treib@chromium.org</owner>
@@ -44609,22 +44544,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram
-    name="PasswordManager.ShouldBlockPasswordForSameOriginButDifferentScheme"
-    enum="BooleanBlocked">
-  <owner>jdoerrie@chromium.org</owner>
-  <summary>
-    This metric is recorded every time Chrome detects a password form
-    submission. The credential might be proposed to be saved, or it might be
-    blocked. It is blocked if the previously detected password form submission
-    was successful, and the current submission is from a URL with the same
-    origin, but a different and insecure scheme. That is, if the previously
-    provisionally saved credential is for https://example.com, a new credential
-    for http://example.com would be blocked. More details can be found in the
-    doc associated with http://crbug.com/571580.
-  </summary>
-</histogram>
-
 <histogram name="PasswordManager.ShouldShowAutoSignInFirstRunExperience"
     enum="BooleanPending">
   <owner>vasilii@chromium.org</owner>
@@ -49905,6 +49824,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Prerender.NoStatePrefetchTTFCP" units="ms">
+  <obsolete>
+    Deprecated December 28, 2016, use Prerender.PrefetchTTFCP instead.
+  </obsolete>
+  <owner>droger@chromium.org</owner>
+  <owner>mattcary@chromium.org</owner>
+  <owner>pasko@chromium.org</owner>
+  <summary>Time to first contentful paint.</summary>
+</histogram>
+
 <histogram name="Prerender.OmniboxNavigationsCouldPrerender">
   <owner>pasko@chromium.org</owner>
   <summary>
@@ -53392,18 +53321,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="ResourcePrefetchPredictor.DatabaseReadiness" units="%">
-  <owner>alexilin@chromium.org</owner>
-  <summary>
-    This metric measures the host coverage of the predictor database: On each
-    navigation, it records what percentage of the top X history entries are
-    found in the predictor DB. Caveats: (1) This metric is only recorded once
-    the user has accumulated enough browsing history, implemented as a minimum
-    threshold of total page visits by the user. (2) This metric is sampled, so
-    it's actually only recorded for 1 out of every K navigations.
-  </summary>
-</histogram>
-
 <histogram name="ResourcePrefetchPredictor.DbStringTooLong">
   <obsolete>
     Deprecated October 2016. No longer recorded.
@@ -65237,49 +65154,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
-<histogram name="SubresourceFilter.PageLoad.NumSubresourceLoads.Disallowed"
-    units="resource loads">
-  <owner>pkalinnikov@chromium.org</owner>
-  <summary>
-    Whenever a page load is finished with subresource filtering activated,
-    records the total number of subresource loads that have been disallowed.
-    This only differs from `MatchedRules` when filtering is performed in dry-run
-    mode.
-  </summary>
-</histogram>
-
-<histogram name="SubresourceFilter.PageLoad.NumSubresourceLoads.Evaluated"
-    units="resource loads">
-  <owner>pkalinnikov@chromium.org</owner>
-  <summary>
-    Whenever a page load is finished with subresource filtering activated,
-    records the total number of subresource loads that have been evaluated. This
-    only differs from 'Total' when some of subdocuments is subject to a
-    deactivating rule with DOCUMENT activation type.
-  </summary>
-</histogram>
-
-<histogram name="SubresourceFilter.PageLoad.NumSubresourceLoads.MatchedRules"
-    units="resource loads">
-  <owner>pkalinnikov@chromium.org</owner>
-  <summary>
-    Whenever a page load is finished with subresource filtering activated,
-    records the total number of subresource loads that have matched filtering
-    rules. This only differs from `Disallowed` when filtering is performed in
-    dry-run mode.
-  </summary>
-</histogram>
-
-<histogram name="SubresourceFilter.PageLoad.NumSubresourceLoads.Total"
-    units="resource loads">
-  <owner>pkalinnikov@chromium.org</owner>
-  <summary>
-    Whenever a page load is finished with subresource filtering activated,
-    records the total number of subresource loads that have gone through the
-    subresource filtering pipeline.
-  </summary>
-</histogram>
-
 <histogram name="SubresourceFilter.PageLoad.RedirectChainLength" units="urls">
   <owner>melandory@chromium.org</owner>
   <summary>Total length of the server redirects during the navigation.</summary>
@@ -76046,9 +75920,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="WinTimeTicks.FailedToChangeCores" enum="WindowsVersion">
-  <obsolete>
-    Removed 01/2017.
-  </obsolete>
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
     Incremented each time the TimeTicks field trial runs on a machine with
@@ -76058,9 +75929,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="WinTimeTicks.MinResolutionNanoseconds" units="nanoseconds">
-  <obsolete>
-    Removed 01/2017.
-  </obsolete>
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
     The smallest non-zero delta reported by subsequent calls to
@@ -76069,9 +75937,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="WinTimeTicks.NonStopTsc">
-  <obsolete>
-    Removed 01/2017.
-  </obsolete>
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
     True if the CPU's timestamp counter ticks at a constant rate regardless of
@@ -76080,9 +75945,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="WinTimeTicks.TickedBackwards" enum="WindowsVersion">
-  <obsolete>
-    Removed 01/2017.
-  </obsolete>
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
     The number of times the TimeTicks field trial failed because
@@ -76091,9 +75953,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="WinTimeTicks.VersionSuccessful" enum="WindowsVersion">
-  <obsolete>
-    Removed 01/2017.
-  </obsolete>
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
     The number of times the TimeTicks field trial succeeded. Broken down by
@@ -76102,9 +75961,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="WinTimeTicks.VersionTotal" enum="WindowsVersion">
-  <obsolete>
-    Removed 01/2017.
-  </obsolete>
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
     The number of times the TimeTicks field trial ran for comparison with
@@ -78187,7 +78043,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="158" label="BDH_INVALID_OPTIONS"/>
   <int value="159" label="RFH_DID_ADD_CONSOLE_MESSAGE_BAD_SEVERITY"/>
   <int value="160" label="AIRH_VOLUME_OUT_OF_RANGE"/>
-  <int value="161" label="BDH_INVALID_DESCRIPTOR_ID"/>
 </enum>
 
 <enum name="BadMessageReasonExtensions" type="int">
@@ -81038,26 +80893,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="6" label="Articles"/>
 </enum>
 
-<enum name="ContentSuggestionsNotificationsAction" type="int">

[dmazzoni, 2017/01/18 16:38:54]

I see a lot of unrelated changes to histograms.xml, could you rebase?

-  <int value="0" label="Tap"/>
-  <int value="1" label="Dismissal"/>
-  <int value="2" label="Hidden (Notification deadline passed)"/>
-  <int value="3" label="Hidden (Suggestion expired)"/>
-  <int value="4" label="Hidden (Chrome became frontmost)"/>
-  <int value="5" label="Hidden (Category disabled)"/>
-  <int value="6" label="Hidden (Content Suggestion Service shut down)"/>
-</enum>
-
-<enum name="ContentSuggestionsNotificationsImpression" type="int">
-  <int value="0" label="Article"/>
-  <int value="1" label="Non-Article"/>
-</enum>
-
-<enum name="ContentSuggestionsNotificationsOptOut" type="int">
-  <int value="0" label="Implicit"/>
-  <int value="1" label="Explicit"/>
-</enum>
-
 <enum name="ContentType" type="int">
   <int value="-1" label="Invalid setting"/>
   <int value="0" label="Cookies setting"/>
@@ -82356,14 +82191,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="15" label="Snackbar promo dismissed (no action taken)"/>
 </enum>
 
-<enum name="DataUrlMimeType" type="int">
-  <int value="0" label="Other"/>
-  <int value="1" label="HTML"/>
-  <int value="2" label="XHTML"/>
-  <int value="3" label="PDF"/>
-  <int value="4" label="SVG"/>
-</enum>
-
 <enum name="DataUsageReportSubmissionResult" type="int">
   <int value="0" label="Successful"/>
   <int value="1" label="Failed"/>
@@ -82637,7 +82464,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="3" label="Network"/>
   <int value="4" label="Scripts"/>
   <int value="5" label="Timeline"/>
-  <int value="6" label="Heap profiler"/>
+  <int value="6" label="Profiles"/>
   <int value="7" label="Audits"/>
   <int value="8" label="Console"/>
   <int value="9" label="Layers"/>
@@ -82648,7 +82475,6 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="14" label="Drawer - Sensors"/>
   <int value="15" label="Drawer - Search"/>
   <int value="16" label="Security"/>
-  <int value="17" label="JavaScript Profiler"/>
 </enum>
 
 <enum name="DevToolsSetting" type="int">
@@ -83117,16 +82943,10 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="3" label="resume"/>
   <int value="4" label="cancel"/>
   <int value="5" label="erase"/>
-  <int value="6" label="(unused)"/>
+  <int value="6" label="set_destination"/>
   <int value="7" label="accept_danger"/>
   <int value="8" label="show"/>
   <int value="9" label="drag"/>
-  <int value="10" label="get_file_icon"/>
-  <int value="11" label="open"/>
-  <int value="12" label="remove_file"/>
-  <int value="13" label="show_default_folder"/>
-  <int value="14" label="set_shelf_enabled"/>
-  <int value="15" label="determine_filename"/>
 </enum>
 
 <enum name="DownloadImageType" type="int">
@@ -89045,6 +88865,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1768" label="DocumentCompleteURLContainingNewline"/>
   <int value="1769" label="DocumentCompleteURLContainingOpenBrace"/>
   <int value="1770" label="DocumentCompleteURLContainingNewlineAndOpenBrace"/>
+  <int value="1771" label="InertAttribute"/>
 </enum>
 
 <enum name="FetchRequestMode" type="int">
@@ -115136,12 +114957,16 @@ value.
       label="No prefetch. Warning: do not compare with the load times of
              prefetched pages (bias)."/>
   <suffix name="Warm" label="Prefetch skips revalidation."/>
+  <affected-histogram name="Prerender.NoStatePrefetchTTFCP"/>
   <affected-histogram name="Prerender.PrefetchTTFCP"/>
 </histogram_suffixes>
 
 <histogram_suffixes name="PrerenderPrefetchMainResourceType" separator=".">
   <suffix name="Cacheable" label="Main resource cacheable."/>
   <suffix name="NoStore" label="Main resource no-store."/>
+  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Cold"/>
+  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Reference"/>
+  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Warm"/>
   <affected-histogram name="Prerender.PrefetchTTFCP.Cold"/>
   <affected-histogram name="Prerender.PrefetchTTFCP.Reference"/>
   <affected-histogram name="Prerender.PrefetchTTFCP.Warm"/>
@@ -115190,6 +115015,13 @@ value.
   <affected-histogram name="Prerender.NoStatePrefetchMainResourceRedirects"/>
   <affected-histogram name="Prerender.NoStatePrefetchResponseTypes"/>
   <affected-histogram name="Prerender.NoStatePrefetchSubResourceRedirects"/>
+  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Cold.Cacheable"/>
+  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Cold.NoStore"/>
+  <affected-histogram
+      name="Prerender.NoStatePrefetchTTFCP.Reference.Cacheable"/>
+  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Reference.NoStore"/>
+  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Warm.Cacheable"/>
+  <affected-histogram name="Prerender.NoStatePrefetchTTFCP.Warm.NoStore"/>
   <affected-histogram name="Prerender.PageVisitedStatus"/>
   <affected-histogram name="Prerender.PerceivedPLT"/>
   <affected-histogram name="Prerender.PerceivedPLTFirstAfterMiss"/>