Android: Minimium swipable state for opening bottom sheets

BottomSheet triggers onSheetOpened event when the sheet offset
goes beyond the height of the minimum swipable state which
depends on |swipeToDissmissEnabled|. The method is mainly used for
the transition from open to closed state. When transitioning
from hidden to open, the minimum swipable state needs to take
|isPeekStateEnabled| since even dismissable sheet can have the
peek state when opening.

Bug: 1014730
Change-Id: I46f4f8edaf7693d9ae4b6fe00a23d635baaa4d4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868211
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708121}

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

@@ -972,7 +972,15 @@ public class BottomSheet
         }
 
         // Do open/close computation based on the minimum allowed state by the sheet's content.
-        float minScrollableHeight = getSheetHeightForState(getMinSwipableSheetState());
+        // Note that when transitioning from hidden to peek, even dismissable sheets may want
+        // to have a peek state.
+        @SheetState
+        int minSwipableState = getMinSwipableSheetState();
+        if (isPeekStateEnabled() && !isSheetOpen() && mCurrentState != mTargetState) {
+            minSwipableState = SheetState.PEEK;
+        }
+
+        float minScrollableHeight = getSheetHeightForState(minSwipableState);
         boolean isAtMinHeight = MathUtils.areFloatsEqual(getCurrentOffsetPx(), minScrollableHeight);
         boolean heightLessThanPeek = getCurrentOffsetPx() < minScrollableHeight;
         // Trigger the onSheetClosed event when the sheet is moving toward the hidden state if peek