Adding an experimental flag to block autoplay with sound in cross-origin iframes

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 35be8bcdbfca608fefc9834ab113b9283f4ce923..ea9c1a85a4b3711bb0972b8f5333e92b42359569 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -92413,6 +92413,8 @@ value.
   <int value="-2119493239" label="enable-app-info-dialog-mac"/>
   <int value="-2117201726" label="disable-gpu-rasterization"/>
   <int value="-2114831248" label="disable-new-ntp"/>
+  <int value="-2113705745"
+      label="CrossOriginMediaPlaybackRequiresUserGesture:enabled"/>
   <int value="-2099035488" label="enable-data-reduction-proxy-bypass-warning"/>
   <int value="-2098610409" label="disable-lcd-text"/>
   <int value="-2097515669" label="disable-cast"/>
@@ -92819,6 +92821,8 @@ value.
   <int value="-314605926" label="protect-sync-credential-on-reauth:enabled"/>
   <int value="-311148335" label="v8-pac-mojo-out-of-process"/>
   <int value="-300018686" label="disable-cloud-import"/>
+  <int value="-297716805"
+      label="CrossOriginMediaPlaybackRequiresUserGesture:disabled"/>
   <int value="-290672626" label="enable-asm-wasm"/>
   <int value="-288316828" label="enable-delegated-renderer"/>
   <int value="-279920685" label="affiliation-based-matching:enabled"/>