[Home] Record some user actions for the Chrome Home BottomSheet

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

 // Copyright 2017 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.widget.bottomsheet;
 
+import org.chromium.chrome.browser.widget.bottomsheet.BottomSheet.BottomSheetContent;
+import org.chromium.chrome.browser.widget.bottomsheet.BottomSheet.SheetState;
+
 /**
  * An interface for notifications about the state of the bottom sheet.
  */
 public interface BottomSheetObserver {
     /**
      * A notification that the sheet has been opened, meaning the sheet is any height greater
      * than its peeking state.
      */
     void onSheetOpened();
 
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      * state. Once the sheet is outside the peek-half range, this event will no longer be
      * called. This event is guaranteed to be called at least once with 0.0f in the peeking state
      * and 1.0f at or past the half state. This means if the sheet is set to the full state from
      * the peeking state, this event will be called a single time with 1.0f.
      *
      * @param transitionFraction The fraction of the way to the half expanded state that the
      *                           sheet is. This will be 0.0f when the sheet is peeking and 1.0f
      *                           when the sheet is half expanded.
      */
     void onTransitionPeekToHalf(float transitionFraction);
+
+    /**
+     * An event for when the sheet changes state.
+     * @param newState The new sheet state. See {@link SheetState}.
+     */
+    void onSheetStateChanged(@SheetState int newState);
+
+    /**
+     * An event for when the sheet content changes.
+     * @param newContent The new {@link BottomSheetContent}.
+     */
+    void onSheetContentChanged(BottomSheetContent newContent);
 }