Don't exit touch mode when launching an ARC++ app with a key event.

We changed the flag according to whether an app is launched by a key
event or not, however it leads to undesirable results because of the
unpredictability of which element will be focused on startup.
This CL stops sending an intent to exit touch mode when launching an
ARC++ app by a key event.

Bug: b:146477273
Test: Launch app by enter key and checks the mode is not changed.
Change-Id: Id57099803572cb3e800553c4cbb1022cc215a1f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1977876Reviewed-by: Stefan Kuhne <skuhne@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729565}

chrome/browser/ui/app_list/arc/arc_app_utils.cc

@@ -156,7 +156,7 @@ bool Launch(content::BrowserContext* context,
 
   arc::mojom::IntentHelperInstance* intent_helper_instance =
       GET_INTENT_HELPER_INSTANCE(SendBroadcast);
-  if (intent_helper_instance) {
+  if (intent_helper_instance && IsMouseOrTouchEventFromFlags(event_flags)) {
     base::DictionaryValue extras;
     extras.SetBoolean("inTouchMode", IsMouseOrTouchEventFromFlags(event_flags));
     std::string extras_string;