Content Settings: Add RevocationObserver to measure when permissions are revoked

chrome/browser/permissions/permission_util.cc

Index: chrome/browser/permissions/permission_util.cc
diff --git a/chrome/browser/permissions/permission_util.cc b/chrome/browser/permissions/permission_util.cc
index d4369c4609207aa11728227c4ac19e1b48e2f388..7f20730ec382b53f3ea32a87f9ec5e866370f310 100644
--- a/chrome/browser/permissions/permission_util.cc
+++ b/chrome/browser/permissions/permission_util.cc
@@ -5,6 +5,9 @@
 #include "chrome/browser/permissions/permission_util.h"
 
 #include "base/logging.h"
+#include "chrome/browser/content_settings/host_content_settings_map_factory.h"
+#include "chrome/browser/permissions/permission_uma_util.h"
+#include "components/content_settings/core/browser/host_content_settings_map.h"
 #include "content/public/browser/permission_type.h"
 
 using content::PermissionType;
@@ -69,3 +72,32 @@ bool PermissionUtil::GetPermissionType(ContentSettingsType type,
   }
   return true;
 }
+
+bool PermissionUtil::SetContentSettingAndRecordRevocation(
+    Profile* profile,
+    const GURL& primary_url,
+    const GURL& secondary_url,
+    ContentSettingsType content_type,
+    std::string resource_identifier,
+    ContentSetting setting) {
+  HostContentSettingsMap* map =
+      HostContentSettingsMapFactory::GetForProfile(profile);
+  ContentSetting previous_value = map->GetContentSetting(
+      primary_url, secondary_url, content_type, resource_identifier);
+
+  map->SetContentSettingDefaultScope(primary_url, secondary_url, content_type,
+                                     resource_identifier, setting);
+
+  ContentSetting final_value = map->GetContentSetting(
+      primary_url, secondary_url, content_type, resource_identifier);
+
+  if (previous_value == CONTENT_SETTING_ALLOW &&
+      final_value != CONTENT_SETTING_ALLOW) {
+    PermissionType permission_type;
+    if (PermissionUtil::GetPermissionType(content_type, &permission_type)) {
+      PermissionUmaUtil::PermissionRevoked(permission_type, primary_url);
+      return true;
+    }
+  }
+  return false;
+}