Mac: Don't relayout tabs if the tab strip's frame didn't change.

chrome/browser/ui/cocoa/browser_window_controller_private.mm

Index: chrome/browser/ui/cocoa/browser_window_controller_private.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_private.mm b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
index 7b6cc3e37b89c0502e5fb8e9b44669d5041e9057..bcd4443c94acb143b50ff93e3529e2f4dfd03ccd 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_private.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
@@ -190,7 +190,7 @@ willPositionSheet:(NSWindow*)sheet
   NSView* tabStripView = [self tabStripView];
   CGFloat tabStripHeight = NSHeight([tabStripView frame]);
   maxY -= tabStripHeight;
-  [tabStripView setFrame:NSMakeRect(0, maxY, width, tabStripHeight)];
+  NSRect tabStripFrame = NSMakeRect(0, maxY, width, tabStripHeight);
 
   // In Yosemite fullscreen, manually add the fullscreen controls to the tab
   // strip.
@@ -260,8 +260,10 @@ willPositionSheet:(NSWindow*)sheet
   }
   [tabStripController_ setRightIndentForControls:rightIndent];
 
-  // Go ahead and layout the tabs.
-  [tabStripController_ layoutTabsWithoutAnimation];
+  if (!NSEqualRects(tabStripFrame, [tabStripView frame])) {

[Robert Sesek, 2014/09/24 17:23:30]

I'd copy part of the CL description to a comment here.

[Andre, 2014/09/24 17:59:37]

Done.

+    [tabStripView setFrame:tabStripFrame];
+    [tabStripController_ layoutTabsWithoutAnimation];
+  }
 
   return maxY;
 }