Stack preview back at top after an active contents switch.

chrome/browser/ui/views/frame/contents_container.cc

 // Copyright 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/frame/contents_container.h"
 
 #include "ui/views/controls/webview/webview.h"
 
 // static
 const char ContentsContainer::kViewClassName[] =
@@ skipping 36 matching lines @@
     preview_ = preview;
     if (preview_)
       AddChildView(preview_);
   }
   preview_web_contents_ = preview_web_contents;
   preview_height_ = height;
   preview_height_units_ = units;
   Layout();
 }
 
+void ContentsContainer::MaybeStackPreviewAtTop() {
+  if (preview_) {
+    RemoveChildView(preview_);

[sky, 2012/11/29 20:57:55]

Will this result in sending a bunch of messages to the preview_? Such as perhaps
its been hidden then removed?

+    AddChildView(preview_);
+    Layout();
+  }
+}
+
 void ContentsContainer::SetActiveTopMargin(int margin) {
   if (active_top_margin_ == margin)
     return;
 
   active_top_margin_ = margin;
   // Make sure we layout next time around. We need this in case our bounds
   // haven't changed.
   InvalidateLayout();
 }
 
@@ skipping 32 matching lines @@
   switch (preview_height_units_) {
     case INSTANT_SIZE_PERCENT:
       return std::min(height(), (height() * preview_height_) / 100);
 
     case INSTANT_SIZE_PIXELS:
       return std::min(height(), preview_height_);
   }
   NOTREACHED() << "unknown units: " << preview_height_units_;
   return 0;
 }