Remove layout during paint in Tab

chrome/browser/ui/views/tabs/tab.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_TABS_TAB_H_
 #define CHROME_BROWSER_UI_VIEWS_TABS_TAB_H_
 
 #include <list>
 #include <string>
 
@@ skipping 153 matching lines @@
 
   // Returns the inverse of the slope of the diagonal portion of the tab outer
   // border.  (This is a positive value, so it's specifically for the slope of
   // the leading edge.)
   //
   // This returns the inverse (dx/dy instead of dy/dx) because we use exact
   // values for the vertical distances between points and then compute the
   // horizontal deltas from those.
   static float GetInverseDiagonalSlope();
 
+  // views::View:
+  void Layout() override;
+
  private:
   friend class TabTest;
   friend class TabStripTest;
   FRIEND_TEST_ALL_PREFIXES(TabStripTest, TabHitTestMaskWhenStacked);
   FRIEND_TEST_ALL_PREFIXES(TabStripTest, TabCloseButtonVisibilityWhenStacked);
 
   // The animation object used to swap the favicon with the sad tab icon.
   class FaviconCrashAnimation;
 
   class TabCloseButton;
@@ skipping 29 matching lines @@
                               const gfx::Point& point,
                               ui::MenuSourceType source_type) override;
 
   // views::MaskedTargeterDelegate:
   bool GetHitTestMask(gfx::Path* mask) const override;
 
   // views::View:
   void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override;
   void OnPaint(gfx::Canvas* canvas) override;
-  void Layout() override;
   void OnThemeChanged() override;
   const char* GetClassName() const override;
   bool GetTooltipText(const gfx::Point& p,
                       base::string16* tooltip) const override;
   bool GetTooltipTextOrigin(const gfx::Point& p,
                             gfx::Point* origin) const override;
   bool OnMousePressed(const ui::MouseEvent& event) override;
   bool OnMouseDragged(const ui::MouseEvent& event) override;
   void OnMouseReleased(const ui::MouseEvent& event) override;
   void OnMouseCaptureLost() override;
@@ skipping 182 matching lines @@
   SkColor button_color_;
 
   // As the majority of the tabs are inactive, and painting tabs is slowish,
   // we cache a handful of the inactive tab backgrounds here.
   static ImageCache* image_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(Tab);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_H_