On Windows, create a new TransportDIB::Handle struct which includes the file

chrome/browser/renderer_host/backing_store_manager.cc

 // Copyright (c) 2010 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_manager.h"
 
 #include "base/sys_info.h"
 #include "base/command_line.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/browser/renderer_host/backing_store.h"
@@ skipping 175 matching lines @@
     backing_store = NULL;
   }
 
   return backing_store;
 }
 
 // static
 void BackingStoreManager::PrepareBackingStore(
     RenderWidgetHost* host,
     const gfx::Size& backing_store_size,
-    TransportDIB::Id bitmap,
+    TransportDIB::Id dib_id,
+    TransportDIB::Handle dib_handle,
     const gfx::Rect& bitmap_rect,
     const std::vector<gfx::Rect>& copy_rects,
     bool* needs_full_paint,
     bool* painted_synchronously) {
   // Default to declaring we're done using the transport DIB so it can be freed.
   *painted_synchronously = true;
 
   BackingStore* backing_store = GetBackingStore(host, backing_store_size);
   if (!backing_store) {
     // We need to get Webkit to generate a new paint here, as we
     // don't have a previous snapshot.
     if (bitmap_rect.size() != backing_store_size ||
         bitmap_rect.x() != 0 || bitmap_rect.y() != 0 ||
         ComputeTotalArea(copy_rects) != backing_store_size.GetArea()) {
       DCHECK(needs_full_paint != NULL);
       *needs_full_paint = true;
       // Makes no sense to paint the transport dib if we are going
       // to request a full paint.
       return;
     }
     backing_store = CreateBackingStore(host, backing_store_size);
   }
 
-  backing_store->PaintToBackingStore(host->process(), bitmap,
-                                     bitmap_rect, copy_rects,
+  backing_store->PaintToBackingStore(host->process(),
+                                     dib_id,
+                                     dib_handle,
+                                     bitmap_rect,
+                                     copy_rects,
                                      painted_synchronously);
 }
 
 // static
 BackingStore* BackingStoreManager::Lookup(RenderWidgetHost* host) {
   if (large_cache) {
     BackingStoreCache::iterator it = large_cache->Get(host);
     if (it != large_cache->end())
       return it->second;
 
@@ skipping 52 matching lines @@
   size_t mem = 0;
   BackingStoreCache::iterator it;
   for (it = large_cache->begin(); it != large_cache->end(); ++it)
     mem += it->second->MemorySize();
 
   for (it = small_cache->begin(); it != small_cache->end(); ++it)
     mem += it->second->MemorySize();
 
   return mem;
 }