📰 Add visibility change triggers for bottom sheet content

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 9aee02c6598bc60681e8739b70bc1152bc3fe76e..104a7e90a85e60d45fe4ec6f46a8364ea66c9378 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
@@ -360,6 +360,26 @@ public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float ve
     }
 
     /**
+     * Returns whether the provided bottom sheet state is in one of the stable open or closed
+     * states: {@link #SHEET_STATE_FULL}, {@link #SHEET_STATE_PEEK} or {@link #SHEET_STATE_HALF}
+     * @param sheetState A {@link SheetState} to test.
+     */
+    public static boolean isStateStable(@SheetState int sheetState) {
+        switch (sheetState) {
+            case SHEET_STATE_PEEK:
+            case SHEET_STATE_HALF:
+            case SHEET_STATE_FULL:
+                return true;
+            case SHEET_STATE_SCROLLING:
+                return false;
+            case SHEET_STATE_NONE: // Should never be tested, internal only value.
+            default:
+                assert false;
+                return false;
+        }
+    }
+
+    /**
      * Constructor for inflation from XML.
      * @param context An Android context.
      * @param atts The XML attributes.