chromeos: adds TouchDeviceServer and wires up in mushrome

ash/aura/shell_port_classic.h

Index: ash/aura/shell_port_classic.h
diff --git a/ash/aura/shell_port_classic.h b/ash/aura/shell_port_classic.h
index 5d8c3f36fee057c80b706728d06bf84acba62688..41bb0c0ba8fd9647b2b9a5575440b6e47b63c6a4 100644
--- a/ash/aura/shell_port_classic.h
+++ b/ash/aura/shell_port_classic.h
@@ -45,6 +45,8 @@ class ASH_EXPORT ShellPortClassic : public ShellPort,
   bool IsInUnifiedModeIgnoreMirroring() const override;
   void SetDisplayWorkAreaInsets(WmWindow* window,
                                 const gfx::Insets& insets) override;
+  std::unique_ptr<display::TouchTransformSetter> CreateTouchTransformDelegate()
+      override;
   void LockCursor() override;
   void UnlockCursor() override;
   void ShowCursor() override;