Expand bottom sheet when URL bar is focused

chrome/android/java/src/org/chromium/chrome/browser/toolbar/BottomToolbarPhone.java

 // Copyright 2016 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.
 
 package org.chromium.chrome.browser.toolbar;
 
 import android.content.Context;
 import android.util.AttributeSet;
 
 import org.chromium.chrome.R;
+import org.chromium.chrome.browser.widget.BottomSheet;
 
 /**
  * Phone specific toolbar that exists at the bottom of the screen.
  */
 public class BottomToolbarPhone extends ToolbarPhone {
+
+    /** A handle to the bottom sheet. */
+    private BottomSheet mBottomSheet;
+
+    /** The state of the bottom sheet before the URL bar was focused. */
+    private int mStateBeforeUrlFocus;
+
     /**
      * Constructs a BottomToolbarPhone object.
      * @param context The Context in which this View object is created.
      * @param attrs The AttributeSet that was specified with this View.
      */
     public BottomToolbarPhone(Context context, AttributeSet attrs) {
         super(context, attrs);
     }
 
     @Override
     protected int getProgressBarTopMargin() {
         // In the case where the toolbar is at the bottom of the screen, the progress bar should
         // be at the top of the toolbar.
         return getContext().getResources().getDimensionPixelSize(R.dimen.toolbar_shadow_height);
     }
+
+    @Override
+    protected void triggerUrlFocusAnimation(final boolean hasFocus) {
+        super.triggerUrlFocusAnimation(hasFocus);
+
+        if (mBottomSheet == null) return;
+
+        if (hasFocus) mStateBeforeUrlFocus = mBottomSheet.getSheetState();
+        mBottomSheet.setSheetState(
+                hasFocus ? BottomSheet.SHEET_STATE_FULL : mStateBeforeUrlFocus, true);
+    }
+
+    @Override
+    public void setBottomSheet(BottomSheet sheet) {
+        mBottomSheet = sheet;
+    }
 }