Adds kind-of-live thumbnail generation for a potential tab switcher.

chrome/browser/renderer_host/render_widget_host_view_win.cc

 // Copyright (c) 2006-2008 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/renderer_host/render_widget_host_view_win.h"
 
 #include "app/gfx/canvas.h"
 #include "app/l10n_util.h"
 #include "app/l10n_util_win.h"
 #include "app/resource_bundle.h"
@@ skipping 632 matching lines @@
     // within the same link/image/etc doesn't cause the tooltip to re-appear.
     if (!tooltip_showing_) {
       if (::IsWindow(tooltip_hwnd_))
         ::SendMessage(tooltip_hwnd_, TTM_POP, 0, 0);
     }
   }
 }
 
 BackingStore* RenderWidgetHostViewWin::AllocBackingStore(
     const gfx::Size& size) {
-  return new BackingStore(size);
+  return new BackingStore(render_widget_host_, size);
 }
 
 void RenderWidgetHostViewWin::SetBackground(const SkBitmap& background) {
   RenderWidgetHostView::SetBackground(background);
   Send(new ViewMsg_SetBackground(render_widget_host_->routing_id(),
                                  background));
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewWin, private:
@@ skipping 21 matching lines @@
 
 void RenderWidgetHostViewWin::OnDestroy() {
   ResetTooltip();
   TrackMouseLeave(false);
 }
 
 void RenderWidgetHostViewWin::OnPaint(HDC dc) {
   DCHECK(render_widget_host_->process()->channel());
 
   about_to_validate_and_paint_ = true;
-  BackingStore* backing_store = render_widget_host_->GetBackingStore();
+  BackingStore* backing_store = render_widget_host_->GetBackingStore(true);
 
   // We initialize |paint_dc| (and thus call BeginPaint()) after calling
   // GetBackingStore(), so that if it updates the invalid rect we'll catch the
   // changes and repaint them.
   about_to_validate_and_paint_ = false;
   CPaintDC paint_dc(m_hWnd);
 
   gfx::Rect damaged_rect(paint_dc.m_ps.rcPaint);
   if (damaged_rect.IsEmpty())
     return;
@@ skipping 607 matching lines @@
     // WM_LBUTTONDOWN.
     SetFocus();
   }
 }
 
 void RenderWidgetHostViewWin::ShutdownHost() {
   shutdown_factory_.RevokeAll();
   render_widget_host_->Shutdown();
   // Do not touch any members at this point, |this| has been deleted.
 }