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

chrome/browser/ui/cocoa/tabs/alert_indicator_button_cocoa.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_TABS_ALERT_INDICATOR_BUTTON_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_TABS_ALERT_INDICATOR_BUTTON_COCOA_H_
 
 #include <memory>
 
 #import "base/mac/scoped_nsobject.h"
+#import "chrome/browser/ui/cocoa/themed_window.h"
 #include "chrome/browser/ui/tabs/tab_utils.h"
 #import "ui/base/cocoa/hover_button.h"
 
 namespace gfx {
 class Animation;
 class AnimationDelegate;
 }  // namespace gfx
 
 // This is an HoverButton subclass that serves as both the alert indicator icon
 // (audio, tab capture, etc.), and as a mute button.  It is meant to only be
 // used as a subview of TabView.
 //
 // When the indicator is transitioned to the audio playing or muting state, the
 // button functionality is enabled and begins handling mouse events.  Otherwise,
 // this view behaves like an image and all mouse events will be handled by the
 // its superview.
 //
 // Note: Send the |-setClickTarget:withAction:| message instead of the
 // |-setTarget:| and |-setAction:| messages to be notified of button clicks.
-@interface AlertIndicatorButton : HoverButton {
+@interface AlertIndicatorButton : HoverButton <ThemedWindowDrawing> {
  @private
   class FadeAnimationDelegate;
 
   // Current TabAlertState.  When animating fade-in/out, this reflects the
   // indicator state at the end of the animation.
   TabAlertState alertState_;
 
   // Alert indicator fade-in/out animation (i.e., only on show/hide, not a
   // continuous animation).
   std::unique_ptr<gfx::AnimationDelegate> fadeAnimationDelegate_;
@@ skipping 31 matching lines @@
 - (void)updateEnabledForMuteToggle;
 
 // Register a message be sent to |target| whenever fade animations complete.  A
 // weak reference on |target| is held.
 - (void)setAnimationDoneTarget:(id)target withAction:(SEL)action;
 
 // Request a message be sent to |target| whenever the enabled button has been
 // clicked.  A weak reference on |target| is held.
 - (void)setClickTarget:(id)target withAction:(SEL)action;
 
+// ThemedWindowDrawing protocol support.
+- (void)windowDidChangeTheme;
+- (void)windowDidChangeActive;
+
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TABS_ALERT_INDICATOR_BUTTON_COCOA_H_