Add a kill switch for all of Web Bluetooth.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 34ff478dd0e8fcbd585372014f3dca41ffd99086..b93a68a30b502abd43e28675459a65ae0b7b4968 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -418,9 +418,15 @@ class CONTENT_EXPORT ContentBrowserClient {
 
   // Allow the embedder to control whether we can use Web Bluetooth.
   // TODO(crbug.com/589228): Replace this with a use of the permission system.
-  virtual bool AllowWebBluetooth(content::BrowserContext* browser_context,
-                                 const url::Origin& requesting_origin,
-                                 const url::Origin& embedding_origin);
+  enum class AllowWebBluetoothResult {
+    ALLOW,
+    BLOCK_POLICY,
+    BLOCK_GLOBALLY_DISABLED,
+  };
+  virtual AllowWebBluetoothResult AllowWebBluetooth(
+      content::BrowserContext* browser_context,
+      const url::Origin& requesting_origin,
+      const url::Origin& embedding_origin);
 
   // Allow the embedder to override the request context based on the URL for
   // certain operations, like cookie access. Returns nullptr to indicate the