Bandaid fix for crash in RecordDismissalType.

This CL adds a quick if to fix the crash. Since I was unable to deduce
which content settings type is causing the crash, I've added a metric
for investigation. Will revisit the original bug in 1 milestone.

Bug: 346343332
Change-Id: Ibdb4d6f42e9d7287bec454006af61ec0160f1d63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5622173
Reviewed-by: Ravjit Uppal <ravjit@chromium.org>
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1313462}

components/permissions/permission_uma_util.cc

@@ -781,8 +781,15 @@ void PermissionUmaUtil::RecordDismissalType(
     const std::vector<ContentSettingsType>& content_settings_types,
     PermissionPromptDisposition ui_disposition,
     DismissalType dismissalType) {
-  RequestTypeForUma type = GetUmaValueForRequestType(
-      ContentSettingsTypeToRequestType(content_settings_types[0]));
+  std::optional<RequestType> request_type =
+      ContentSettingsTypeToRequestTypeIfExists(content_settings_types[0]);
+  if (!request_type.has_value()) {
+    base::UmaHistogramEnumeration(
+        "Permissions.Prompt.Dismissed.InvalidContentSetting",
+        content_settings_types[0]);
+    return;
+  }
+  RequestTypeForUma type = GetUmaValueForRequestType(request_type.value());
 
   if (content_settings_types.size() > 1) {
     type = RequestTypeForUma::MULTIPLE_AUDIO_AND_VIDEO_CAPTURE;

tools/metrics/histograms/metadata/permissions/histograms.xml

@@ -798,6 +798,18 @@ chromium-metrics-reviews@google.com.
   </summary>
 </histogram>
 
+<histogram name="Permissions.Prompt.Dismissed.InvalidContentSetting"
+    enum="ContentSetting" expires_after="2025-06-01">
+  <owner>andypaicu@chromium.org</owner>
+  <owner>src/components/permissions/PERMISSIONS_OWNERS</owner>
+  <summary>
+    This metric is used to investigate a crash observed when a certain type of
+    permission prompt is dismissed. It's recorded when a permission prompt is
+    dismissed with an invalid content setting (aka one that does not have a
+    corresponding request type) and it records the content setting itself.
+  </summary>
+</histogram>
+
 <histogram name="Permissions.Prompt.Dismissed.PriorDismissCount2" units="units"
     expires_after="2024-07-09">
   <owner>engedy@chromium.org</owner>