Update profile switcher button on Linux.

ui/views/controls/button/label_button.cc

 // Copyright (c) 2012 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.
 
 #include "ui/views/controls/button/label_button.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 405 matching lines @@
   InvalidateLayout();
   // The entire button has to be repainted here, since the native theme can
   // define the tint for the entire background/border/focus ring.
   SchedulePaint();
 }
 
 void LabelButton::AddInkDropLayer(ui::Layer* ink_drop_layer) {
   image()->SetPaintToLayer();
   image()->layer()->SetFillsBoundsOpaquely(false);
   ink_drop_container_->AddInkDropLayer(ink_drop_layer);
+  InstallInkDropMask(ink_drop_layer);

[Peter Kasting, 2017/04/27 02:13:18]

It looks from code search like several other places called AddInkDropLayer()
besides just here.  Don't you need to modify them too?  (For example,
BubbleIconView)

[Evan Stade, 2017/04/27 20:28:52]

They would need this if they were to use a mask, but I don't want to hunt them
all down. Adding this here doesn't make them any less (hypothetically) broken.

Removing the code but not adding back InstallInkDropMask() in InkDropHostView
was an oversight.

 }
 
 void LabelButton::RemoveInkDropLayer(ui::Layer* ink_drop_layer) {
   image()->DestroyLayer();
+  ResetInkDropMask();
   ink_drop_container_->RemoveInkDropLayer(ink_drop_layer);
 }
 
 std::unique_ptr<InkDrop> LabelButton::CreateInkDrop() {
   return UseFloodFillInkDrop() ? CreateDefaultFloodFillInkDropImpl()
                                : CustomButton::CreateInkDrop();
 }
 
 std::unique_ptr<views::InkDropRipple> LabelButton::CreateInkDropRipple() const {
   return UseFloodFillInkDrop()
@@ skipping 161 matching lines @@
           : PlatformStyle::TextColorForButton(button_state_colors_, *this);
   if (state() != STATE_DISABLED && label_->enabled_color() != color)
     label_->SetEnabledColor(color);
 }
 
 bool LabelButton::UseFloodFillInkDrop() const {
   return !GetText().empty();
 }
 
 }  // namespace views