Ensure BottomSheet#getActiveTab returns non-null after load.

chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java

Index: chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java b/chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java
index 8e1ef5d09570c64b0c92236686ed229c47d10be8..7f099da7370fb662ab78e4e42de918ad6d718133 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/widget/bottomsheet/BottomSheet.java
@@ -723,9 +723,12 @@ public class BottomSheet
 
     @Override
     public Tab getActiveTab() {
-        return mTabModelSelector == null || mNtpController.isShowingNewTabUi()
-                ? null
-                : mTabModelSelector.getCurrentTab();
+        if (mTabModelSelector == null) return null;
+        if (mNtpController.isShowingNewTabUi() && isVisible()
+                && getTargetSheetState() != SHEET_STATE_PEEK) {
+            return null;
+        }
+        return mTabModelSelector.getCurrentTab();
     }
 
     @Override