[Offline pages] Filter out pages cached by different tabs on tab helper

chrome/browser/android/offline_pages/offline_page_utils.cc

Index: chrome/browser/android/offline_pages/offline_page_utils.cc
diff --git a/chrome/browser/android/offline_pages/offline_page_utils.cc b/chrome/browser/android/offline_pages/offline_page_utils.cc
index 82f5ff7dac3df53f1214c553f30a50effadaff27..6320e525fe41a039c7f4ba13623ac1a83d2caf80 100644
--- a/chrome/browser/android/offline_pages/offline_page_utils.cc
+++ b/chrome/browser/android/offline_pages/offline_page_utils.cc
@@ -13,6 +13,7 @@
 #include "chrome/browser/android/offline_pages/offline_page_mhtml_archiver.h"
 #include "chrome/browser/android/offline_pages/offline_page_model_factory.h"
 #include "chrome/browser/android/offline_pages/offline_page_tab_helper.h"
+#include "chrome/browser/android/tab_android.h"
 #include "components/offline_pages/offline_page_feature.h"
 #include "components/offline_pages/offline_page_item.h"
 #include "components/offline_pages/offline_page_model.h"
@@ -176,4 +177,14 @@ const OfflinePageItem* OfflinePageUtils::GetOfflinePageFromWebContents(
   return tab_helper ? tab_helper->offline_page() : nullptr;
 }
 
+// static
+bool OfflinePageUtils::GetTabId(content::WebContents* web_contents,
+                                int* tab_id) {
+  TabAndroid* tab_android = TabAndroid::FromWebContents(web_contents);
+  if (!tab_android)
+    return false;
+  *tab_id = tab_android->GetAndroidId();
+  return true;
+}
+
 }  // namespace offline_pages