Add ScopedMacRTL class for Cocoa browser RTL testing

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..787d98e3c07bbb1ee0aedc363874c4934d9a7738 100644
--- a/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
+++ b/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
@@ -31,7 +31,6 @@
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #include "chrome/browser/ui/cocoa/drag_util.h"
 #import "chrome/browser/ui/cocoa/image_button_cell.h"
-#include "chrome/browser/ui/cocoa/l10n_util.h"
 #import "chrome/browser/ui/cocoa/new_tab_button.h"
 #import "chrome/browser/ui/cocoa/tab_contents/favicon_util_mac.h"
 #import "chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.h"
@@ -66,6 +65,7 @@
 #include "ui/base/cocoa/animation_utils.h"
 #include "ui/base/cocoa/cocoa_base_utils.h"
 #import "ui/base/cocoa/tracking_area.h"
+#import "ui/base/cocoa/rtl_feature.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/models/list_selection_model.h"
@@ -137,7 +137,7 @@ private:
 };
 
 CGFloat FlipXInView(NSView* view, CGFloat width, CGFloat x) {
-  if (cocoa_l10n_util::ShouldDoExperimentalRTLLayout())
+  if (ui::ShouldDoExperimentalRTLLayout())
     return [view frame].size.width - x - width;
   return x;
 }
@@ -831,7 +831,7 @@ NSRect FlipRectInView(NSView* view, NSRect rect) {
       } else {
         NSView* penultimateTab = [self viewAtIndex:numberOfOpenTabs - 2];
         availableResizeWidth_ =
-            cocoa_l10n_util::ShouldDoExperimentalRTLLayout()
+            ui::ShouldDoExperimentalRTLLayout()
                 ? FlipXInView(tabStripView_, 0, NSMinX([penultimateTab frame]))
                 : NSMaxX([penultimateTab frame]);
       }
@@ -841,7 +841,7 @@ NSRect FlipRectInView(NSView* view, NSRect rect) {
       // are currently below their maximum width and can grow).
       NSView* lastTab = [self viewAtIndex:numberOfOpenTabs - 1];
       availableResizeWidth_ =
-          cocoa_l10n_util::ShouldDoExperimentalRTLLayout()
+          ui::ShouldDoExperimentalRTLLayout()
               ? FlipXInView(tabStripView_, 0, NSMinX([lastTab frame]))
               : NSMaxX([lastTab frame]);
     }
@@ -899,7 +899,7 @@ NSRect FlipRectInView(NSView* view, NSRect rect) {
 
 - (BOOL)isTabFullyVisible:(TabView*)tab {
   NSRect frame = [tab frame];
-  if (cocoa_l10n_util::ShouldDoExperimentalRTLLayout()) {
+  if (ui::ShouldDoExperimentalRTLLayout()) {
     return NSMinX(frame) >= [self trailingIndentForControls] &&
            NSMaxX(frame) <= [self tabAreaRightEdge];
   } else {
@@ -909,7 +909,7 @@ NSRect FlipRectInView(NSView* view, NSRect rect) {
 }
 
 - (CGFloat)tabAreaRightEdge {
-  CGFloat rightEdge = cocoa_l10n_util::ShouldDoExperimentalRTLLayout()
+  CGFloat rightEdge = ui::ShouldDoExperimentalRTLLayout()
                           ? [self leadingIndentForControls]
                           : [self trailingIndentForControls];
   return NSMaxX([tabStripView_ frame]) - rightEdge;
@@ -1073,7 +1073,7 @@ NSRect FlipRectInView(NSView* view, NSRect rect) {
       // If the back edge is behind the placeholder's back edge, but the
       // mid is in front of it of it, slide over to make space for it.
       bool shouldLeaveGap;
-      if (cocoa_l10n_util::ShouldDoExperimentalRTLLayout()) {
+      if (ui::ShouldDoExperimentalRTLLayout()) {
         const CGFloat tabMidpoint =
             NSMidX(FlipRectInView(tabStripView_, tabFrame));
         shouldLeaveGap = tabMidpoint < NSMaxX(placeholderFrame_);
@@ -1188,7 +1188,7 @@ NSRect FlipRectInView(NSView* view, NSRect rect) {
     // so we don't have to check it against the available space. We do need
     // to make sure we put it after any placeholder.
     CGFloat maxTabX = MAX(offset, NSMaxX(placeholderFrame_) - kTabOverlap);
-    if (cocoa_l10n_util::ShouldDoExperimentalRTLLayout()) {
+    if (ui::ShouldDoExperimentalRTLLayout()) {
       maxTabX = FlipXInView(tabStripView_, [newTabButton_ frame].size.width,
                             maxTabX) -
                 (2 * kNewTabButtonOffset);
@@ -1214,7 +1214,7 @@ NSRect FlipRectInView(NSView* view, NSRect rect) {
       if (visible && animate) {
         ScopedNSAnimationContextGroup localAnimationGroup(true);
         BOOL movingBack = NSMinX(newTabNewFrame) < NSMinX(newTabTargetFrame_);
-        if (cocoa_l10n_util::ShouldDoExperimentalRTLLayout())
+        if (ui::ShouldDoExperimentalRTLLayout())
           movingBack = !movingBack;
 
         if (!movingBack) {
@@ -1757,7 +1757,7 @@ NSRect FlipRectInView(NSView* view, NSRect rect) {
   // No placeholder, return the end of the strip.
   if (placeholderTab_ == nil)
     return count;
-  BOOL isRTL = cocoa_l10n_util::ShouldDoExperimentalRTLLayout();
+  BOOL isRTL = ui::ShouldDoExperimentalRTLLayout();
   double placeholderX =
       isRTL ? NSMaxX(placeholderFrame_) : placeholderFrame_.origin.x;
   int index = 0;
@@ -2049,7 +2049,7 @@ NSRect FlipRectInView(NSView* view, NSRect rect) {
 
   DCHECK(index && disposition);
   NSInteger i = 0;
-  BOOL isRTL = cocoa_l10n_util::ShouldDoExperimentalRTLLayout();
+  BOOL isRTL = ui::ShouldDoExperimentalRTLLayout();
   for (TabController* tab in tabArray_.get()) {
     NSView* view = [tab view];
     DCHECK([view isKindOfClass:[TabView class]]);
@@ -2270,14 +2270,12 @@ NSRect FlipRectInView(NSView* view, NSRect rect) {
 }
 
 - (void)addCustomWindowControls {
-  BOOL shouldFlipWindowControls =
-      cocoa_l10n_util::ShouldFlipWindowControlsInRTL();
+  BOOL shouldFlipWindowControls = ui::ShouldFlipWindowControlsInRTL();
   if (!customWindowControls_) {
     // Make the container view.
     CGFloat height = NSHeight([tabStripView_ frame]);
     CGFloat width = [self leadingIndentForControls];
-    if (cocoa_l10n_util::ShouldDoExperimentalRTLLayout() &&
-        !shouldFlipWindowControls)
+    if (ui::ShouldDoExperimentalRTLLayout() && !shouldFlipWindowControls)
       // The trailing indent is correct in this case, since the controls should
       // stay on the left.
       width = [self trailingIndentForControls];