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

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

Index: chrome/browser/ui/cocoa/tabs/alert_indicator_button_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/tabs/alert_indicator_button_cocoa.mm b/chrome/browser/ui/cocoa/tabs/alert_indicator_button_cocoa.mm
index 408c546d650818a67c94d67c4e38043b5ca4c3a8..2181d66b00c78f0ecff6652940287d49ae424511 100644
--- a/chrome/browser/ui/cocoa/tabs/alert_indicator_button_cocoa.mm
+++ b/chrome/browser/ui/cocoa/tabs/alert_indicator_button_cocoa.mm
@@ -8,6 +8,7 @@
 #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"
@@ -85,10 +86,15 @@ class FadeAnimationDelegate : public gfx::AnimationDelegate {
     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]);
   }
 }