Revert of Remove supports_touch_events flag from BasicDesktopEnvironment

remoting/host/basic_desktop_environment.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 REMOTING_HOST_BASIC_DESKTOP_ENVIRONMENT_H_
 #define REMOTING_HOST_BASIC_DESKTOP_ENVIRONMENT_H_
 
 #include <cstdint>
 #include <memory>
 #include <string>
@@ skipping 28 matching lines @@
   void SetCapabilities(const std::string& capabilities) override;
   uint32_t GetDesktopSessionId() const override;
 
  protected:
   friend class BasicDesktopEnvironmentFactory;
 
   BasicDesktopEnvironment(
       scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> video_capture_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
+      scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
+      bool supports_touch_events);
 
   scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner() const {
     return caller_task_runner_;
   }
 
   scoped_refptr<base::SingleThreadTaskRunner> video_capture_task_runner()
       const {
     return video_capture_task_runner_;
   }
 
@@ skipping 23 matching lines @@
   // Used to run UI code.
   scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
 
   // Options shared between |DesktopCapturer| and |MouseCursorMonitor|. It
   // might contain expensive resources, thus justifying the sharing.
   // Also: it's dynamically allocated to avoid having to bring in
   // desktop_capture_options.h which brings in X11 headers which causes hard to
   // find build errors.
   std::unique_ptr<webrtc::DesktopCaptureOptions> desktop_capture_options_;
 
+  // True if the touch events capability should be offered.
+  const bool supports_touch_events_;
+
   DISALLOW_COPY_AND_ASSIGN(BasicDesktopEnvironment);
 };
 
 // Used to create |BasicDesktopEnvironment| instances.
 class BasicDesktopEnvironmentFactory : public DesktopEnvironmentFactory {
  public:
   BasicDesktopEnvironmentFactory(
       scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> video_capture_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
   ~BasicDesktopEnvironmentFactory() override;
 
   // DesktopEnvironmentFactory implementation.
   bool SupportsAudioCapture() const override;
 
+  void set_supports_touch_events(bool enable) {
+    supports_touch_events_ = enable;
+  }
+
  protected:
   scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner() const {
     return caller_task_runner_;
   }
 
   scoped_refptr<base::SingleThreadTaskRunner> video_capture_task_runner()
       const {
     return video_capture_task_runner_;
   }
 
   scoped_refptr<base::SingleThreadTaskRunner> input_task_runner() const {
     return input_task_runner_;
   }
 
   scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner() const {
     return ui_task_runner_;
   }
 
+  bool supports_touch_events() const { return supports_touch_events_; }
+
  private:
   // Task runner on which methods of DesktopEnvironmentFactory interface should
   // be called.
   scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner_;
 
   // Used to run video capture tasks.
   scoped_refptr<base::SingleThreadTaskRunner> video_capture_task_runner_;
 
   // Used to run input-related tasks.
   scoped_refptr<base::SingleThreadTaskRunner> input_task_runner_;
 
   // Used to run UI code.
   scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
 
+  // True if the touch events capability should be offered by the
+  // DesktopEnvironment instances.
+  bool supports_touch_events_;
+
   DISALLOW_COPY_AND_ASSIGN(BasicDesktopEnvironmentFactory);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_BASIC_DESKTOP_ENVIRONMENT_H_