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

chrome/browser/renderer_host/backing_store_mac.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/backing_store.h"
 
 #include "base/logging.h"
 #include "chrome/common/transport_dib.h"
 #include "skia/ext/platform_canvas.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 
-BackingStore::BackingStore(const gfx::Size& size)
-    : size_(size) {
+BackingStore::BackingStore(RenderWidgetHost* widget, const gfx::Size& size)
+    : render_widget_host_(widget),
+      size_(size) {
   if (!canvas_.initialize(size.width(), size.height(), true))
     SK_CRASH();
 }
 
 BackingStore::~BackingStore() {
 }
 
 void BackingStore::PaintRect(base::ProcessHandle process,
                              TransportDIB* bitmap,
                              const gfx::Rect& bitmap_rect) {
@@ skipping 89 matching lines @@
         memcpy(x, x + stride * dy, len);
         x -= stride;
       }
     }
   }
 
   // Now paint the new bitmap data.
   PaintRect(process, bitmap, bitmap_rect);
   return;
 }