Introduce chrome.displaySource API

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 7ba8957d25c1e82eda29f92afc93e5e5999ed8bf..7ef491283f9ce42ed24068082a1c0906fbb32809 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -58935,6 +58935,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="389" label="EASY_UNLOCK_PRIVATE_ON_CONNECTION_STATUS_CHANGED"/>
   <int value="390" label="EASY_UNLOCK_PRIVATE_ON_DATA_RECEIVED"/>
   <int value="391" label="EASY_UNLOCK_PRIVATE_ON_SEND_COMPLETED"/>
+  <int value="392" label="DISPLAY_SOURCE_ON_SINKS_UPDATED"/>
 </enum>
 
 <enum name="ExtensionFileWriteResult" type="int">
@@ -60077,6 +60078,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1094" label="SETTINGSPRIVATE_GETDEFAULTZOOMPERCENTFUNCTION"/>
   <int value="1095" label="SETTINGSPRIVATE_SETDEFAULTZOOMPERCENTFUNCTION"/>
   <int value="1096" label="BLUETOOTHPRIVATE_CONNECT"/>
+  <int value="1097" label="DISPLAYSOURCE_GETAVAILABLESINKS"/>
+  <int value="1098" label="DISPLAYSOURCE_REQUESTAUTHENTICATION"/>
 </enum>
 
 <enum name="ExtensionInstallCause" type="int">