Adds clipping to the tabs when stacked. This is necessary so we don't

chrome/browser/ui/views/tabs/tab_unittest.cc

 // 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.
 
 #include "chrome/browser/ui/views/tabs/tab.h"
 
 #include "chrome/browser/ui/tabs/tab_strip_selection_model.h"
 #include "chrome/browser/ui/views/tabs/tab_controller.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/views/test/views_test_base.h"
@@ skipping 29 matching lines @@
       BaseTab* tab,
       const views::MouseEvent& event,
       const TabStripSelectionModel& original_selection) OVERRIDE {}
   virtual void ContinueDrag(const views::MouseEvent& event) OVERRIDE {}
   virtual bool EndDrag(bool canceled) OVERRIDE { return false; }
   virtual BaseTab* GetTabAt(BaseTab* tab,
                             const gfx::Point& tab_in_tab_coordinates) OVERRIDE {
     return NULL;
   }
   virtual void ClickActiveTab(const BaseTab* tab) const OVERRIDE {}
+  virtual bool ShouldPaintTab(const BaseTab* tab, gfx::Rect* clip) OVERRIDE {
+    return true;
+  }
 
  private:
   TabStripSelectionModel selection_model_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeTabController);
 };
 
 typedef views::ViewsTestBase TabTest;
 
 TEST_F(TabTest, HitTestTopPixel) {
@@ skipping 18 matching lines @@
 
   // If the window is maximized, however, we want clicks in the top edge to
   // select the tab.
   widget.Maximize();
   EXPECT_TRUE(tab.HitTest(gfx::Point(middle_x, 0)));
 
   // But clicks in the area above the slanted sides should still miss.
   EXPECT_FALSE(tab.HitTest(gfx::Point(0, 0)));
   EXPECT_FALSE(tab.HitTest(gfx::Point(tab.width() - 1, 0)));
 }