chrome/blink: Add functionality for in-product help for media elements.

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 deb387193073039522101c80f8ac62ce8a0acfcf..ffa06682041c058b989566b9432add53a0068fd7 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -91613,6 +91613,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <suffix name="IPH_DownloadPageScreenshot"
       label="In product help download page for screenshot."/>
   <suffix name="IPH_DownloadHome" label="In product help download home."/>
+  <suffix name="IPH_MediaDownload" label="In product help media download."/>
   <suffix name="IPH_NewTab" label="In product help new tab."/>
   <suffix name="IPH_IncognitoWindow" label="In product help incognito window."/>
   <suffix name="IPH_NewTabTip" label="In product help new tab tip."/>
@@ -92427,8 +92428,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 <histogram_suffixes name="NavigationType" separator=".">
   <suffix name="NewPageInPageOriginMismatch"
       label="in-document new page navigation with a non-matching origin"/>
-  <suffix name="NewPageInPage"
-      label="in-document new page navigation"/>
+  <suffix name="NewPageInPage" label="in-document new page navigation"/>
   <suffix name="NewPagePendingEntryMatches"
       label="new page navigation which found a pending entry"/>
   <suffix name="NewPageNoMatchingEntry"
@@ -92438,7 +92438,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <suffix name="ExistingPageDifferentDocumentIntendedAsNew"
       label="existing page navigation which is intended as new"/>
   <suffix name="ExistingPageSameDocumentRestoredBrowserInitiated"
-      label="in-document existing page browser-initiated navigation which is restored"/>
+      label="in-document existing page browser-initiated navigation which is
+             restored"/>
   <suffix name="ExistingPageSameDocumentBrowserInitiated"
       label="in-document existing page browser-initiated navigation"/>
   <suffix name="ExistingPageRestoredBrowserInitiated"