Fix repainting not happening when switching tabs after resizing the browser. I didn't copy this beh…

content/browser/tab_contents/tab_contents_view_win.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 "content/browser/tab_contents/tab_contents_view_win.h"
 
 #include "base/bind.h"
 #include "content/browser/renderer_host/render_view_host_factory.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_win.h"
@@ skipping 321 matching lines @@
   if (drag_dest_.get()) {
     RevokeDragDrop(GetNativeView());
     drag_dest_ = NULL;
   }
   return 0;
 }
 
 LRESULT TabContentsViewWin::OnWindowPosChanged(
     UINT message, WPARAM wparam, LPARAM lparam, BOOL& handled) {
   WINDOWPOS* window_pos = reinterpret_cast<WINDOWPOS*>(lparam);
+  if (window_pos->flags & SWP_HIDEWINDOW) {
+    tab_contents_->HideContents();
+    return 0;
+  }
+
+  // The TabContents was shown by a means other than the user selecting a
+  // Tab, e.g. the window was minimized then restored.
+  if (window_pos->flags & SWP_SHOWWINDOW)
+    tab_contents_->ShowContents();
+
+  // Unless we were specifically told not to size, cause the renderer to be
+  // sized to the new bounds, which forces a repaint. Not required for the
+  // simple minimize-restore case described above, for example, since the
+  // size hasn't changed.
   if (window_pos->flags & SWP_NOSIZE)
     return 0;
 
   gfx::Size size(window_pos->cx, window_pos->cy);
   if (tab_contents_->GetInterstitialPage())
     tab_contents_->GetInterstitialPage()->SetSize(size);
   RenderWidgetHostView* rwhv = tab_contents_->GetRenderWidgetHostView();
   if (rwhv)
     rwhv->SetSize(size);
 
@@ skipping 30 matching lines @@
       // This message is reflected from the view() to this window.
       if (GET_KEYSTATE_WPARAM(message->wParam) & MK_CONTROL) {
         tab_contents_->GetDelegate()->ContentsZoomChange(
             GET_WHEEL_DELTA_WPARAM(message->wParam) > 0);
         return 1;
       }
     break;
   }
   return 0;
 }