Tag TransportDIBs with the device scale factor they expect.

content/browser/renderer_host/backing_store_manager.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/renderer_host/backing_store_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/memory/mru_cache.h"
 #include "base/sys_info.h"
@@ skipping 180 matching lines @@
   return backing_store;
 }
 
 // static
 void BackingStoreManager::PrepareBackingStore(
     RenderWidgetHost* host,
     const gfx::Size& backing_store_size,
     TransportDIB::Id bitmap,
     const gfx::Rect& bitmap_rect,
     const std::vector<gfx::Rect>& copy_rects,
+    float scale_factor,
     const base::Closure& completion_callback,
     bool* needs_full_paint,
     bool* scheduled_completion_callback) {
   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() ||
         !(backing_store = CreateBackingStore(host, backing_store_size))) {
       DCHECK(needs_full_paint != NULL);
       *needs_full_paint = true;
       *scheduled_completion_callback = false;
       // Makes no sense to paint the transport dib if we are going
       // to request a full paint.
       return;
     }
   }
 
   backing_store->PaintToBackingStore(host->GetProcess(), bitmap,
-                                     bitmap_rect, copy_rects,
+                                     bitmap_rect, copy_rects, scale_factor,
                                      completion_callback,
                                      scheduled_completion_callback);
 }
 
 // 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 38 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;
 }