Refactor the view hierarchy of snackbars and infobars

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

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2015 The Chromium Authors. All rights reserved.
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file. -->
 
 <merge xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto" >
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:orientation="vertical">
 
-        <org.chromium.chrome.browser.compositor.CompositorViewHolder
-            android:id="@+id/compositor_view_holder"
+        <android.support.design.widget.CoordinatorLayout
+            android:id="@+id/coordinator"
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_weight="1" >
 
+            <org.chromium.chrome.browser.compositor.CompositorViewHolder
+                android:id="@+id/compositor_view_holder"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent" />
+
             <ViewStub
                 android:id="@+id/omnibox_results_container_stub"
                 android:layout_width="match_parent"
                 android:layout_height="match_parent"
                 android:layout_marginTop="@dimen/tab_strip_height"
                 android:inflatedId="@+id/omnibox_results_container"
-                android:layout="@layout/omnibox_results_container"
-                app:layout_behavior="org.chromium.chrome.browser.compositor.CompositorViewHolderBehavior" />
+                android:layout="@layout/omnibox_results_container" />
 
-        </org.chromium.chrome.browser.compositor.CompositorViewHolder>
+            <FrameLayout
+                android:id="@+id/bottom_container"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:layout_gravity="start|bottom" />
+
+        </android.support.design.widget.CoordinatorLayout>
 
         <HorizontalScrollView
             android:id="@+id/keyboard_accessory"
             android:layout_height="@dimen/keyboard_accessory_height"
             android:layout_width="match_parent"
             android:background="@drawable/keyboard_accessory_background"
             android:contentDescription="@string/autofill_keyboard_accessory_content_description"
             android:fillViewport="true"
             android:scrollbars="none"
             android:visibility="gone" />
@@ skipping 23 matching lines @@
         android:layout_width="match_parent"
         android:layout_height="match_parent" />
     <!-- This empty view is used as the anchor for custom menu -->
     <View
         android:id="@+id/menu_anchor_stub"
         android:layout_width="0px"
         android:layout_height="0px"
         android:layout_gravity="bottom|start"
         />
 </merge>