Implement PDF page count signal for contextual cueing

Change-Id: Iea3689885283853f7f62d5c0da0b2829222472bf
Bug: 389750286
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6219781
Reviewed-by: Sophie Chang <[email protected]>
Commit-Queue: Raj T <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1415359}
diff --git a/chrome/browser/contextual_cueing/contextual_cueing_features.cc b/chrome/browser/contextual_cueing/contextual_cueing_features.cc
index f85707a9..b88d51a 100644
--- a/chrome/browser/contextual_cueing/contextual_cueing_features.cc
+++ b/chrome/browser/contextual_cueing/contextual_cueing_features.cc
@@ -46,4 +46,9 @@
                                                    "VisitedDomainsLimit",
                                                    20);
 
+const base::FeatureParam<base::TimeDelta> kPdfPageCountCaptureDelay(
+    &kContextualCueing,
+    "PdfPageCountCaptureDelay",
+    base::Seconds(4));
+
 }  // namespace contextual_cueing