🏠 Add expand button and flag to enable it

chrome/android/java/src/org/chromium/chrome/browser/toolbar/ToolbarPhone.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.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
@@ skipping 204 matching lines @@
     /**
      * Offsets applied to the <i>contents</i> of the omnibox if we are showing a New Tab Page.
      * This can be different from {@link #mLocationBarBackgroundNtpOffset} due to the fact that we
      * extend the omnibox horizontally beyond the screen boundaries when focused, to hide its
      * rounded corners.
      */
     private float mLocationBarNtpOffsetLeft;
     private float mLocationBarNtpOffsetRight;
 
     private final Rect mNtpSearchBoxBounds = new Rect();
-    private final Point mNtpSearchBoxTranslation = new Point();
+    protected final Point mNtpSearchBoxTranslation = new Point();
 
     private final int mToolbarSidePadding;
     private final int mLocationBarBackgroundCornerRadius;
     protected int mLocationBarVerticalMargin;
 
     private ValueAnimator mBrandColorTransitionAnimation;
     private boolean mBrandColorTransitionActive;
 
     private boolean mIsHomeButtonEnabled;
 
@@ skipping 393 matching lines @@
             return 0;
         } else if (ApiCompatibilityUtils.isLayoutRtl(this)) {
             return Math.max(mToolbarSidePadding,
                     shouldHideEndToolbarButtons() ? 0
                                                   : mToolbarButtonsContainer.getMeasuredWidth());
         } else {
             return getBoundsAfterAccountingForLeftButton();
         }
     }
 
-    private int getBoundsAfterAccountingForLeftButton() {
+    protected int getBoundsAfterAccountingForLeftButton() {
         int padding = mToolbarSidePadding;
         if (mHomeButton.getVisibility() != GONE) padding = mHomeButton.getMeasuredWidth();
         return padding;
     }
 
     private int getViewBoundsRightOfLocationBar(VisualState visualState) {
         // Uses getMeasuredWidth()s instead of getRight() because this is called in onMeasure
         // and the layout values have not yet been set.
         if (visualState == VisualState.NEW_TAB_NORMAL) {
             return getMeasuredWidth();
@@ skipping 798 matching lines @@
             mPreTextureCaptureAlpha = getAlpha();
             setAlpha(1);
         } else {
             setAlpha(mPreTextureCaptureAlpha);
             updateShadowVisibility();
             mPreTextureCaptureAlpha = 1f;
         }
     }
 
     // TODO(dtrainor): This is always true when in the tab switcher (crbug.com/710750).
-    private boolean isTabSwitcherAnimationRunning() {
+    protected boolean isTabSwitcherAnimationRunning() {
         return mTabSwitcherState == ENTERING_TAB_SWITCHER
                 || mTabSwitcherState == EXITING_TAB_SWITCHER;
     }
 
     private void updateViewsForTabSwitcherMode() {
         int tabSwitcherViewsVisibility = mTabSwitcherState != STATIC_TAB  ? VISIBLE : INVISIBLE;
         int browsingViewsVisibility = mTabSwitcherState != STATIC_TAB ? INVISIBLE : VISIBLE;
 
         for (View view : mTabSwitcherModeViews) {
             view.setVisibility(tabSwitcherViewsVisibility);
@@ skipping 815 matching lines @@
         });
 
         if (mControlsVisibilityDelegate != null) {
             mFullscreenCalloutToken =
                     mControlsVisibilityDelegate.showControlsPersistentAndClearOldToken(
                             mFullscreenCalloutToken);
         }
     }
 }