Android: Bottom sheet top shadow height

This CL removes the gap between infobar and bottom sheet to make them work more
nicely. Bottom sheet's top shadow height dimension needs to be bigger.

Bug: 1025098
Change-Id: I0264d19b2ab75efbdee3a4cadc697ea7ebc1a9ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1943783Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720708}

chrome/android/java/res/values/dimens.xml

@@ -616,7 +616,7 @@
     <!-- Bottom Sheet dimensions -->
     <dimen name="bottom_sheet_min_full_half_distance">140dp</dimen>
     <dimen name="bottom_sheet_peek_height">56dp</dimen>
-    <dimen name="bottom_sheet_toolbar_shadow_height">16dp</dimen>
+    <dimen name="bottom_sheet_toolbar_shadow_height">24dp</dimen>
 
     <!--  Miscellaneous dimensions -->
     <dimen name="text_bubble_menu_anchor_y_inset">14dp</dimen>