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 60700d7134ada3a18cf3c30bbe4d778ed0de1604..fbe3d20b2e08cb0d2d96c40a405051857508b02f 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -34727,6 +34727,8 @@ 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">
@@ -34904,6 +34906,7 @@ 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">