Revert of Remove supports_touch_events flag from BasicDesktopEnvironment

remoting/host/basic_desktop_environment.cc

 // 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.
 
 #include "remoting/host/basic_desktop_environment.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 38 matching lines @@
   return nullptr;
 }
 
 std::unique_ptr<webrtc::MouseCursorMonitor>
 BasicDesktopEnvironment::CreateMouseCursorMonitor() {
   return base::MakeUnique<MouseCursorMonitorProxy>(video_capture_task_runner_,
                                                    *desktop_capture_options_);
 }
 
 std::string BasicDesktopEnvironment::GetCapabilities() const {
+  if (supports_touch_events_)
+    return protocol::kTouchEventsCapability;
+
   return std::string();
 }
 
 void BasicDesktopEnvironment::SetCapabilities(const std::string& capabilities) {
 }
 
 uint32_t BasicDesktopEnvironment::GetDesktopSessionId() const {
   return UINT32_MAX;
 }
 
 std::unique_ptr<webrtc::DesktopCapturer>
 BasicDesktopEnvironment::CreateVideoCapturer() {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 
   std::unique_ptr<DesktopCapturerProxy> result(
       new DesktopCapturerProxy(video_capture_task_runner_));
   result->CreateCapturer(*desktop_capture_options_);
   return std::move(result);
 }
 
 BasicDesktopEnvironment::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)
     : caller_task_runner_(caller_task_runner),
       video_capture_task_runner_(video_capture_task_runner),
       input_task_runner_(input_task_runner),
       ui_task_runner_(ui_task_runner),
       desktop_capture_options_(new webrtc::DesktopCaptureOptions(
-          webrtc::DesktopCaptureOptions::CreateDefault())) {
+          webrtc::DesktopCaptureOptions::CreateDefault())),
+      supports_touch_events_(supports_touch_events) {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
   desktop_capture_options_->set_detect_updated_region(true);
 #if defined(USE_X11)
   IgnoreXServerGrabs(desktop_capture_options_->x_display()->display(), true);
 #endif
 }
 
 BasicDesktopEnvironmentFactory::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)
     : caller_task_runner_(caller_task_runner),
       video_capture_task_runner_(video_capture_task_runner),
       input_task_runner_(input_task_runner),
-      ui_task_runner_(ui_task_runner) {}
+      ui_task_runner_(ui_task_runner),
+      supports_touch_events_(false) {}
 
 BasicDesktopEnvironmentFactory::~BasicDesktopEnvironmentFactory() {}
 
 bool BasicDesktopEnvironmentFactory::SupportsAudioCapture() const {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 
   return AudioCapturer::IsSupported();
 }
 
 }  // namespace remoting