Add ui::GrabDesktopSnapshot for Windows.

ui/snapshot/snapshot_win.cc

Index: ui/snapshot/snapshot_win.cc
diff --git a/ui/snapshot/snapshot_win.cc b/ui/snapshot/snapshot_win.cc
index 3a8d1e715765722381f8fa8e25592c039427bdb1..90d2248dd5047262e333a34824daf17d011c8c19 100644
--- a/ui/snapshot/snapshot_win.cc
+++ b/ui/snapshot/snapshot_win.cc
@@ -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);
@@ -32,19 +32,9 @@ gfx::Rect GetWindowBounds(gfx::NativeWindow window_handle) {
                    content_rect.bottom - content_rect.top);
 }
 
-}  // namespace
-
-namespace ui {
-
-bool GrabViewSnapshot(gfx::NativeView view_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) {
+bool GrabWindowSnapshotImpl(HWND 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 +93,31 @@ bool GrabWindowSnapshot(gfx::NativeWindow window_handle,
   return true;
 }
 
+}  // namespace
+
+namespace ui {
+
+#if !defined(USE_AURA)
+
+bool GrabViewSnapshot(gfx::NativeView view_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(window_handle);
+  return GrabWindowSnapshotImpl(window_handle, png_representation,
+                                snapshot_bounds);
+}
+
+#endif  // !defined(USE_AURA)
+
+bool GrabDesktopSnapshot(std::vector<unsigned char>* png_representation,
+                         const gfx::Rect& snapshot_bounds) {
+  return GrabWindowSnapshotImpl(NULL, png_representation, snapshot_bounds);
+}
+
 }  // namespace ui