linux_aura: Implement dropping in chrome.

ui/views/widget/desktop_aura/desktop_root_window_host_x11.h

 // 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.
 
 #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_X11_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_X11_H_
 
 #include <X11/Xlib.h>
 
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
 #undef RootWindow
 
 #include "base/basictypes.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/root_window_host.h"
 #include "ui/base/cursor/cursor_loader_x11.h"
+#include "ui/base/dragdrop/desktop_selection_provider_aurax11.h"
 #include "ui/base/x/x11_atom_cache.h"
 #include "ui/gfx/rect.h"
 #include "ui/views/views_export.h"
 #include "ui/views/widget/desktop_aura/desktop_root_window_host.h"
 
 namespace aura {
 namespace client {
 class FocusClient;
 class ScreenPositionClient;
 }
 }
 
 namespace views {
 class DesktopActivationClient;
 class DesktopCaptureClient;
+class DesktopDragDropClientAuraX11;
 class DesktopDispatcherClient;
 class X11DesktopWindowMoveClient;
 class X11WindowEventFilter;
 
 namespace corewm {
 class CursorManager;
 }
 
 class VIEWS_EXPORT DesktopRootWindowHostX11
     : public DesktopRootWindowHost,
       public aura::RootWindowHost,
+      public ui::DesktopSelectionProviderAuraX11,
       public MessageLoop::Dispatcher {
  public:
   DesktopRootWindowHostX11(
       internal::NativeWidgetDelegate* native_widget_delegate,
       DesktopNativeWidgetAura* desktop_native_widget_aura,
       const gfx::Rect& initial_bounds);
   virtual ~DesktopRootWindowHostX11();
 
   // A way of converting an X11 |xid| host window into a |content_window_|.
   static aura::Window* GetContentWindowForXID(XID xid);
@@ skipping 110 matching lines @@
   virtual bool CopyAreaToSkCanvas(const gfx::Rect& source_bounds,
                                   const gfx::Point& dest_offset,
                                   SkCanvas* canvas) OVERRIDE;
   virtual bool GrabSnapshot(
       const gfx::Rect& snapshot_bounds,
       std::vector<unsigned char>* png_representation) OVERRIDE;
   virtual void PostNativeEvent(const base::NativeEvent& native_event) OVERRIDE;
   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
   virtual void PrepareForShutdown() OVERRIDE;
 
+  // Overridden from DesktopSelectionProviderAuraX11:
+  virtual void SetDropHandler(
+      ui::OSExchangeDataProviderAuraX11* handler) OVERRIDE;
+
   // Overridden from Dispatcher:
   virtual bool Dispatch(const base::NativeEvent& event) OVERRIDE;
 
   base::WeakPtrFactory<DesktopRootWindowHostX11> close_widget_factory_;
 
   // X11 things
   // The display and the native X window hosting the root window.
   Display* xdisplay_;
   ::Window xwindow_;
 
@@ skipping 17 matching lines @@
   // We are owned by the RootWindow, but we have to have a back pointer to it.
   aura::RootWindow* root_window_;
 
   // aura:: objects that we own.
   scoped_ptr<DesktopCaptureClient> capture_client_;
   scoped_ptr<aura::client::FocusClient> focus_client_;
   scoped_ptr<DesktopActivationClient> activation_client_;
   scoped_ptr<views::corewm::CursorManager> cursor_client_;
   scoped_ptr<DesktopDispatcherClient> dispatcher_client_;
   scoped_ptr<aura::client::ScreenPositionClient> position_client_;
+  scoped_ptr<DesktopDragDropClientAuraX11> drag_drop_client_;
 
   // Current Aura cursor.
   gfx::NativeCursor current_cursor_;
 
   scoped_ptr<X11WindowEventFilter> x11_window_event_filter_;
   scoped_ptr<X11DesktopWindowMoveClient> x11_window_move_client_;
 
   // TODO(beng): Consider providing an interface to DesktopNativeWidgetAura
   //             instead of providing this route back to Widget.
   internal::NativeWidgetDelegate* native_widget_delegate_;
 
   DesktopNativeWidgetAura* desktop_native_widget_aura_;
 
   aura::RootWindowHostDelegate* root_window_host_delegate_;
   aura::Window* content_window_;
 
+  // We forward drop related messages to this object.
+  ui::OSExchangeDataProviderAuraX11* drop_handler_;
+
   // The current root window host that has capture. While X11 has something
   // like Windows SetCapture()/ReleaseCapture(), it is entirely implicit and
   // there are no notifications when this changes. We need to track this so we
   // can notify widgets when they have lost capture, which controls a bunch of
   // things in views like hiding menus.
   static DesktopRootWindowHostX11* g_current_capture;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopRootWindowHostX11);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_X11_H_