Implement rudimentary touchscreen support in mus.

components/mus/mus_app.cc

 // Copyright 2014 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 "components/mus/mus_app.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 179 matching lines @@
   } else {
     // TODO(rjkroege): It is possible that we might want to generalize the
     // GpuState object.
     platform_display_init_params_.gpu_state = new GpuState();
   }
 
   // Gpu must be running before the PlatformScreen can be initialized.
   platform_screen_->Init();
   window_server_.reset(
       new ws::WindowServer(this, platform_display_init_params_.surfaces_state));
+
+  // DeviceDataManager must be initialized before TouchController. On non-Linux
+  // platforms there is no DeviceDataManager so don't create touch controller.
+  if (ui::DeviceDataManager::HasInstance())
+    touch_controller_.reset(
+        new ws::TouchController(window_server_->display_manager()));
 }
 
 bool MusApp::AcceptConnection(Connection* connection) {
   connection->AddInterface<mojom::Clipboard>(this);
   connection->AddInterface<mojom::DisplayManager>(this);
   connection->AddInterface<mojom::UserAccessManager>(this);
   connection->AddInterface<WindowTreeHostFactory>(this);
   connection->AddInterface<mojom::WindowManagerWindowTreeFactory>(this);
   connection->AddInterface<mojom::WindowTreeFactory>(this);
   if (test_config_)
@@ skipping 115 matching lines @@
 }
 
 void MusApp::OnCreatedPhysicalDisplay(int64_t id, const gfx::Rect& bounds) {
   platform_display_init_params_.display_bounds = bounds;
   platform_display_init_params_.display_id = id;
 
   // Display manages its own lifetime.
   ws::Display* host_impl =
       new ws::Display(window_server_.get(), platform_display_init_params_);
   host_impl->Init(nullptr);
+
+  if (touch_controller_)
+    touch_controller_->UpdateTouchTransforms();
 }
 
 }  // namespace mus