Implement ui::ClipboardMus.

ui/views/mus/window_manager_connection.cc

Index: ui/views/mus/window_manager_connection.cc
diff --git a/ui/views/mus/window_manager_connection.cc b/ui/views/mus/window_manager_connection.cc
index e6280123a8e1d489bc6fcdba777f3c5bacfb0b0a..d924fc88fa5cbd6ad71de37ffb308abe48e71f62 100644
--- a/ui/views/mus/window_manager_connection.cc
+++ b/ui/views/mus/window_manager_connection.cc
@@ -18,6 +18,7 @@
 #include "services/shell/public/cpp/connector.h"
 #include "ui/events/devices/device_data_manager.h"
 #include "ui/gfx/geometry/mojo/geometry_type_converters.h"
+#include "ui/views/mus/clipboard_mus.h"
 #include "ui/views/mus/native_widget_mus.h"
 #include "ui/views/mus/screen_mus.h"
 #include "ui/views/pointer_watcher.h"
@@ -110,6 +111,11 @@ WindowManagerConnection::WindowManagerConnection(
   screen_.reset(new ScreenMus(this));
   screen_->Init(connector);
 
+  // We keep a weak ptr to clipboard_
+  std::unique_ptr<ClipboardMus> clipboard(new ClipboardMus);
+  clipboard->Init(connector);
+  ui::Clipboard::SetClipboardForCurrentThread(std::move(clipboard));
+
   // TODO(sad): We should have a DeviceDataManager implementation that talks to
   // a mojo service to learn about the input-devices on the system.
   // http://crbug.com/601981
@@ -126,6 +132,8 @@ WindowManagerConnection::~WindowManagerConnection() {
   // destroy it while we are still valid.
   window_tree_connection_.reset();
 
+  ui::Clipboard::DestroyClipboardForCurrentThread();
+
   ui::DeviceDataManager::DeleteInstance();
 }