Add ui::GrabDesktopSnapshot for Windows.

ui/snapshot/snapshot_hwnd_win.cc

Index: ui/snapshot/snapshot_hwnd_win.cc
diff --git a/ui/snapshot/snapshot_win.cc b/ui/snapshot/snapshot_hwnd_win.cc
similarity index 88%
copy from ui/snapshot/snapshot_win.cc
copy to ui/snapshot/snapshot_hwnd_win.cc
index 3a8d1e715765722381f8fa8e25592c039427bdb1..61a152ccdc21022e9fb05cb19991d3a042a49ddf 100644
--- a/ui/snapshot/snapshot_win.cc
+++ b/ui/snapshot/snapshot_hwnd_win.cc
@@ -1,8 +1,8 @@
-// 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"
@@ -14,7 +14,7 @@
 
 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);
@@ -35,16 +35,11 @@ gfx::Rect GetWindowBounds(gfx::NativeWindow window_handle) {
 }  // 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());
 
@@ -103,4 +98,5 @@ bool GrabWindowSnapshot(gfx::NativeWindow window_handle,
   return true;
 }
 
+}  // namespace internal
 }  // namespace ui