Support copying a partial rectangle region from the compositing surface on Win.

content/browser/renderer_host/render_widget_host_impl.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/render_widget_host_impl.h"
 
 #include <utility>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 485 matching lines @@
 }
 
 void RenderWidgetHostImpl::CopyFromBackingStore(
     const gfx::Rect& src_subrect,
     const gfx::Size& accelerated_dst_size,
     const base::Callback<void(bool)>& callback,
     skia::PlatformCanvas* output) {
   if (view_ && is_accelerated_compositing_active_) {
     TRACE_EVENT0("browser",
         "RenderWidgetHostImpl::CopyFromBackingStore::FromCompositingSurface");
-#if defined(USE_AURA) || defined(OS_LINUX) || defined(OS_MACOSX)
     gfx::Rect copy_rect = src_subrect.IsEmpty() ?
         gfx::Rect(view_->GetViewBounds().size()) : src_subrect;
-#else
-    // Just passes an empty rect to CopyFromCompositingSurface on non-Aura Win
-    // because copying a partial rectangle is not supported.
-    gfx::Rect copy_rect;
-#endif
     view_->CopyFromCompositingSurface(copy_rect,
                                       accelerated_dst_size,
                                       callback,
                                       output);
     return;
   }
 
   BackingStore* backing_store = GetBackingStore(false);
   if (!backing_store) {
     callback.Run(false);
@@ skipping 1416 matching lines @@
   // indicate that no callback is in progress (i.e. without this line
   // DelayedAutoResized will not get called again).
   new_auto_size_.SetSize(0, 0);
   if (!should_auto_resize_)
     return;
 
   OnRenderAutoResized(new_size);
 }
 
 }  // namespace content