Add ui::GrabDesktopSnapshot for Windows.

ui/snapshot/snapshot_hwnd_win.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2013 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 "ui/snapshot/snapshot.h"
+#include "ui/snapshot/snapshot_hwnd_win.h"
 
 #include "base/win/scoped_gdi_object.h"
 #include "base/win/scoped_hdc.h"
 #include "base/win/scoped_select_object.h"
 #include "ui/gfx/codec/png_codec.h"
 #include "ui/gfx/gdi_util.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 namespace {
 
-gfx::Rect GetWindowBounds(gfx::NativeWindow window_handle) {
+gfx::Rect GetWindowBounds(HWND window_handle) {
   RECT content_rect = {0, 0, 0, 0};
   if (window_handle) {
     ::GetWindowRect(window_handle, &content_rect);
   } else {
     MONITORINFO monitor_info = {};
     monitor_info.cbSize = sizeof(monitor_info);
     if (GetMonitorInfo(MonitorFromWindow(NULL, MONITOR_DEFAULTTOPRIMARY),
                        &monitor_info)) {
       content_rect = monitor_info.rcMonitor;
     }
   }
   content_rect.right++;  // Match what PrintWindow wants.
 
   return gfx::Rect(content_rect.right - content_rect.left,
                    content_rect.bottom - content_rect.top);
 }
 
 }  // namespace
 
 namespace ui {
+namespace internal {
 
-bool GrabViewSnapshot(gfx::NativeView view_handle,
+bool GrabHwndSnapshot(HWND window_handle,
                       std::vector<unsigned char>* png_representation,
                       const gfx::Rect& snapshot_bounds) {
-  return GrabWindowSnapshot(view_handle, png_representation, snapshot_bounds);
-}
-
-bool GrabWindowSnapshot(gfx::NativeWindow window_handle,
-                        std::vector<unsigned char>* png_representation,
-                        const gfx::Rect& snapshot_bounds) {
   DCHECK(snapshot_bounds.right() <= GetWindowBounds(window_handle).right());
   DCHECK(snapshot_bounds.bottom() <= GetWindowBounds(window_handle).bottom());
 
   // Create a memory DC that's compatible with the window.
   HDC window_hdc = GetWindowDC(window_handle);
   base::win::ScopedCreateDC mem_hdc(CreateCompatibleDC(window_hdc));
 
   BITMAPINFOHEADER hdr;
   gfx::CreateBitmapHeader(snapshot_bounds.width(),
                           snapshot_bounds.height(),
@@ skipping 38 matching lines @@
                         snapshot_bounds.size(),
                         snapshot_bounds.width() * 4, true,
                         std::vector<gfx::PNGCodec::Comment>(),
                         png_representation);
 
   ReleaseDC(window_handle, window_hdc);
 
   return true;
 }
 
+}  // namespace internal
 }  // namespace ui