Introduce the bottom sheet class for Chrome Home

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

 // 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.
 
 package org.chromium.chrome.browser.toolbar;
 
 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.PorterDuff;
 import android.graphics.Rect;
@@ skipping 95 matching lines @@
     @Override
     public boolean gatherTransparentRegion(Region region) {
         // Reset the translation on the control container before attempting to compute the
         // transparent region.
         float translateY = getTranslationY();
         setTranslationY(0);
 
         ViewUtils.gatherTransparentRegionsForOpaqueView(this, region);
 
         setTranslationY(translateY);
+        region.setEmpty();

[Ian Wen, 2017/01/11 19:46:53]

Q: what's this for?

[mdjones, 2017/01/12 21:26:57]

I moved this over to BottomSheet.java. I have it set to empty so the bottom
sheet is not clipped when it is swiped up. Since this function is not
necessarily called when the sheet is animating, I can't update the region
correctly. I need a more correct solution for this.

 
         return true;
     }
 
     /**
      * Invalidate the entire capturing bitmap region.
      */
     public void invalidateBitmap() {
         ((ToolbarViewResourceAdapter) getToolbarResourceAdapter()).forceInvalidate();
     }
@@ skipping 149 matching lines @@
 
         @Override
         public boolean shouldRecognizeSwipe(MotionEvent e1, MotionEvent e2) {
             if (isOnTabStrip(e1)) return false;
             if (mToolbar.shouldIgnoreSwipeGesture()) return false;
             if (UiUtils.isKeyboardShowing(getContext(), ToolbarControlContainer.this)) return false;
             return true;
         }
     }
 }