[Mac] Update tab audio icon to Material Design and tweak close box color.

chrome/browser/ui/cocoa/tabs/tab_view.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/tabs/tab_view.h"
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/mac/sdk_forward_declarations.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 35 matching lines @@
 const CGFloat kRapidCloseDist = 2.5;
 
 @interface TabView(MaterialDesign)
 + (void)drawTabLeftMaskImage;
 + (void)drawTabRightMaskImage;
 + (void)drawTabLeftEdgeImage;
 + (void)drawTabMiddleEdgeImage;
 + (void)drawTabRightEdgeImage;
 @end
 
+@interface TabController(Private)
+// The TabView's close button.
+- (HoverCloseButton*)closeButton;
+@end
+
 namespace {
 
 NSImage* imageForResourceID(int resource_id) {
   if (!ui::MaterialDesignController::IsModeMaterial()) {
     ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
     return [rb.GetNativeImageNamed(resource_id).CopyNSImage() autorelease];
   }
 
   CGFloat imageWidth = resource_id == IDR_TAB_ACTIVE_CENTER ? 1 : 18;
   SEL theSelector = 0;
@@ skipping 517 matching lines @@
   return [titleView_ isHidden];
 }
 
 - (void)setTitleHidden:(BOOL)titleHidden {
   if (titleHidden == [titleView_ isHidden])
     return;
   [titleView_ setHidden:titleHidden];
   [self setNeedsDisplayInRect:[titleView_ frame]];
 }
 
+- (SkColor)closeButtonColor {
+  return [[controller_ closeButton] iconColor];
+}
+
 - (void)setState:(NSCellStateValue)state {
   if (state_ == state)
     return;
   state_ = state;
   [self setNeedsDisplay:YES];
 }
 
 - (void)setClosing:(BOOL)closing {
   closing_ = closing;  // Safe because the property is nonatomic.
   // When closing, ensure clicks to the close button go nowhere.
@@ skipping 334 matching lines @@
   NSAffineTransform* transform = [NSAffineTransform transform];
   [transform scaleXBy:-1 yBy:1];
   [transform translateXBy:-17.5 yBy:-0.25];
   [bezierPath transformUsingAffineTransform:transform];
 
   [[NSColor whiteColor] set];
   [bezierPath fill];
 }
 
 @end  // @implementation TabView(MaterialDesign)