Revert of Remove supports_touch_events flag from BasicDesktopEnvironment

remoting/host/basic_desktop_environment.cc

Index: remoting/host/basic_desktop_environment.cc
diff --git a/remoting/host/basic_desktop_environment.cc b/remoting/host/basic_desktop_environment.cc
index 5c1d48d7a0912605a83595510cbcb906c9853513..b3853c9694c5db08854c8908b048d137bf305bfb 100644
--- a/remoting/host/basic_desktop_environment.cc
+++ b/remoting/host/basic_desktop_environment.cc
@@ -56,6 +56,9 @@
 }
 
 std::string BasicDesktopEnvironment::GetCapabilities() const {
+  if (supports_touch_events_)
+    return protocol::kTouchEventsCapability;
+
   return std::string();
 }
 
@@ -80,13 +83,15 @@
     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)
@@ -102,7 +107,8 @@
     : 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() {}