Fix smallest touch size of menu button on duet

Thouch menu_button_wrapper is big enough to meet the requirement of
smallest touch size, it does not handle the click or touch events.
The image button, which is handling the click event, inside the
menu_button_wrapper is too small.

Bug: 1038691
Change-Id: If1f6bd4e0dabdc238f9f1a37604b843cb60c360e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1986251Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Lijin Shen <lazzzis@google.com>
Cr-Commit-Position: refs/heads/master@{#728630}

chrome/android/java/res/layout/bottom_toolbar_browsing.xml

@@ -19,6 +19,7 @@
     <org.chromium.chrome.browser.toolbar.HomeButton
         android:id="@+id/home_button"
         app:tint="@color/standard_mode_tint"
+        android:background="?attr/selectableItemBackgroundBorderless"
         android:contentDescription="@string/accessibility_toolbar_btn_home"
         style="@style/SplitToolbarButton" />
 
@@ -29,6 +30,7 @@
         android:src="@drawable/ic_share_white_24dp"
         app:tint="@color/standard_mode_tint"
         android:contentDescription="@string/share"
+        android:background="?attr/selectableItemBackgroundBorderless"
         style="@style/SplitToolbarButton" />
 
     <include layout="@layout/toolbar_space" />
@@ -51,6 +53,7 @@
         android:id="@+id/tab_switcher_button"
         style="@style/SplitToolbarButton"
         app:menuMaxWidth="@dimen/tab_switcher_menu_width"
+        android:background="?attr/selectableItemBackgroundBorderless"
         android:contentDescription="@string/accessibility_toolbar_btn_tabswitcher_toggle_default"
         app:menuVerticalOverlapAnchor="false" />
 

chrome/android/java/res/layout/bottom_toolbar_menu_button.xml

@@ -15,21 +15,19 @@
 
     <org.chromium.ui.widget.ChromeImageButton
         android:id="@+id/menu_button"
-        android:layout_height="wrap_content"
-        android:layout_width="wrap_content"
-        android:background="@null"
+        style="@style/SplitToolbarButton"
         android:src="@drawable/ic_more_vert_24dp"
         android:importantForAccessibility="no"
         android:layout_gravity="center"
+        android:background="?attr/selectableItemBackgroundBorderless"
         app:tint="@color/standard_mode_tint" />
 
     <ImageView
         android:id="@+id/menu_badge"
-        android:layout_height="wrap_content"
-        android:layout_width="wrap_content"
-        android:background="@null"
+        style="@style/SplitToolbarButton"
         android:src="@drawable/badge_update_dark"
         tools:ignore="ContentDescription"
+        android:background="?attr/selectableItemBackgroundBorderless"
         android:importantForAccessibility="no"
         android:layout_gravity="center"
         android:visibility="invisible" />