Do RTL tabstrip transforms before animating tabs.

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

Index: chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
diff --git a/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm b/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
index 116c021143d4a3b9a8a072ff822c65b919704b47..ac56c5b6aa1f02730602ec168f632d7cc3b122f2 100644
--- a/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
+++ b/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
@@ -1127,6 +1127,10 @@ NSRect FlipRectInView(NSView* view, NSRect rect) {
     }
     isLastTabPinned = isPinned;
 
+    // Flip if in RTL mode.
+    tabFrame.origin.x =
+        FlipXInView(tabStripView_, tabFrame.size.width, tabFrame.origin.x);
+
     if (laidOutNonPinnedTabs > numberOfNonPinnedTabs) {
       // There is not enough space to fit this tab.
       tabFrame.size.width = 0;
@@ -1145,9 +1149,6 @@ NSRect FlipRectInView(NSView* view, NSRect rect) {
       }
     }
 
-    tabFrame.origin.x =
-        FlipXInView(tabStripView_, tabFrame.size.width, tabFrame.origin.x);
-
     // Check the frame by identifier to avoid redundant calls to animator.
     id frameTarget = visible && animate ? [[tab view] animator] : [tab view];
     NSValue* identifier = [NSValue valueWithPointer:[tab view]];