Implement a JavaScript API for document scanning

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 4290a7dd94dfdf04232fff6e81168c520bc7a7ce..ab7aa39b577f99456148b904239f94ccf0e28eb8 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -34740,6 +34740,8 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="772" label="FILESYSTEMPROVIDERINTERNAL_READFILEREQUESTEDSUCCESS"/>
   <int value="773" label="FILESYSTEMPROVIDERINTERNAL_READFILEREQUESTEDERROR"/>
   <int value="774" label="NETWORKINGPRIVATE_GETNETWORKS"/>
+  <int value="775" label="DOCUMENT_SCAN_LISTSCANNERS"/>
+  <int value="776" label="DOCUMENT_SCAN_SCAN"/>
 </enum>
 
 <enum name="ExtensionInstallCause" type="int">
@@ -34917,6 +34919,7 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="60" label="kAccessibilityFeaturesModify"/>
   <int value="61" label="kAccessibilityFeaturesRead"/>
   <int value="62" label="kBluetoothPrivate"/>
+  <int value="63" label="kDocumentScan"/>
 </enum>
 
 <enum name="ExtensionServiceVerifyAllSuccess" type="int">