Upstream Chrome on iOS source code [9/11].

ios/chrome/browser/ui/toolbar/toolbar_tools_menu_button.mm

+// 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.
+
+#import "ios/chrome/browser/ui/toolbar/toolbar_tools_menu_button.h"
+
+#include "ios/chrome/browser/ui/toolbar/toolbar_button_tints.h"
+#import "ios/chrome/browser/ui/uikit_ui_util.h"
+
+@interface ToolbarToolsMenuButton ()
+// Updates the tint configuration based on the button's situation, e.g. whether
+// the tools menu is visible or not.
+- (void)updateTintOfButton;
+@end
+
+@interface ToolbarToolsMenuButton () {
+  // The style of the toolbar the button is in.
+  ToolbarControllerStyle style_;
+  // Whether the tools menu is visible.
+  BOOL toolsMenuVisible_;
+  // Whether the reading list contains unread items.
+  BOOL readingListContainsUnreadItems_;
+}
+@end
+
+@implementation ToolbarToolsMenuButton
+
+- (instancetype)initWithFrame:(CGRect)frame
+                        style:(ToolbarControllerStyle)style {
+  if (self = [super initWithFrame:frame]) {
+    style_ = style;
+
+    [self setTintColor:toolbar::NormalButtonTint(style_)
+              forState:UIControlStateNormal];
+    [self setTintColor:toolbar::HighlighButtonTint(style_)
+              forState:UIControlStateHighlighted];
+
+    [self setImageEdgeInsets:UIEdgeInsetsMakeDirected(0, -3, 0, 0)];
+    UIImage* image = [UIImage imageNamed:@"toolbar_tools"];
+    image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
+    [self setImage:image forState:UIControlStateNormal];
+  }
+  return self;
+}
+
+- (void)setToolsMenuIsVisible:(BOOL)toolsMenuVisible {
+  toolsMenuVisible_ = toolsMenuVisible;
+  [self updateTintOfButton];
+}
+
+- (void)setReadingListContainsUnreadItems:(BOOL)readingListContainsUnreadItems {
+  readingListContainsUnreadItems_ = readingListContainsUnreadItems;
+  [self updateTintOfButton];
+}
+
+#pragma mark - Private
+
+- (void)updateTintOfButton {
+  if (toolsMenuVisible_ || readingListContainsUnreadItems_) {
+    [self setTintColor:toolbar::HighlighButtonTint(style_)
+              forState:UIControlStateNormal];
+  } else {
+    [self setTintColor:toolbar::NormalButtonTint(style_)
+              forState:UIControlStateNormal];
+  }
+}
+
+@end