[Mac] Reverse tab alert buttons (i.e. audio) in RTL

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

 // 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.
 
 #import "chrome/browser/ui/cocoa/tabs/alert_indicator_button_cocoa.h"
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
 #include "base/macros.h"
 #include "base/threading/thread_task_runner_handle.h"
+#import "chrome/browser/ui/cocoa/l10n_util.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_view.h"
 #include "content/public/browser/user_metrics.h"
 #include "ui/gfx/animation/animation.h"
 #include "ui/gfx/animation/animation_delegate.h"
 #include "ui/gfx/image/image.h"
 
 namespace {
 
 // The minimum required click-to-select area of an inactive tab before allowing
 // the click-to-mute functionality to be enabled.  This value is in terms of
@@ skipping 57 matching lines @@
   // is moved into another window, make sure that it updates the theme.
   [self updateIconForState:showingAlertState_];
 }
 
 - (void)updateIconForState:(TabAlertState)aState {
   if (aState != TabAlertState::NONE) {
     TabView* const tabView = base::mac::ObjCCast<TabView>([self superview]);
     SkColor iconColor = [tabView iconColor];
     NSImage* tabIndicatorImage =
         chrome::GetTabAlertIndicatorImage(aState, iconColor).ToNSImage();
+    NSImage* affordanceImage =
+        chrome::GetTabAlertIndicatorAffordanceImage(aState, iconColor)
+            .ToNSImage();
+    if (cocoa_l10n_util::ShouldDoExperimentalRTLLayout()) {
+      tabIndicatorImage = cocoa_l10n_util::FlippedImage(tabIndicatorImage);
+      affordanceImage = cocoa_l10n_util::FlippedImage(affordanceImage);

[Avi (use Gerrit), 2017/02/23 18:55:39]

Both at once! 👍

+    }
     [self setImage:tabIndicatorImage];
-    affordanceImage_.reset(
-        [chrome::GetTabAlertIndicatorAffordanceImage(aState, iconColor)
-               .ToNSImage() retain]);
+    affordanceImage_.reset([affordanceImage retain]);
   }
 }
 
 - (void)transitionToAlertState:(TabAlertState)nextState {
   if (nextState == alertState_)
     return;
 
   [self updateIconForState:nextState];
 
   if ((alertState_ == TabAlertState::AUDIO_PLAYING &&
@@ skipping 201 matching lines @@
 - (void)windowDidChangeTheme {
   // Force the alert icon to update because the icon color may change based
   // on the current theme.
   [self updateIconForState:alertState_];
 }
 
 - (void)windowDidChangeActive {
 }
 
 @end