Add Chrome flags to control input compatibility logic

This is a first step to clean up special input compatibility logic
in ARC.
With the CL, we can control the logic via chrome://flags.

Bug: b:191461076
Test: ash_components_unittests
Change-Id: Ifebd48abb6017f17cd46ae13b95674345b0e8dd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4647814
Reviewed-by: Takashi Toyoshima <[email protected]>
Reviewed-by: Toshiki Kikuchi <[email protected]>
Reviewed-by: Hiroki Sato <[email protected]>
Commit-Queue: Yuichiro Hanada <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1163451}
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index f2402834..0407209 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -5227,6 +5227,16 @@
     "priority to Play instead of using default install priority specified "
     "in Play";
 
+const char kArcTouchscreenEmulationName[] =
+    "Enable touchscreen emulation for compatibility on specific ARC apps.";
+const char kArcTouchscreenEmulationDesc[] =
+    "Enable touchscreen emulation for compatibility on specific ARC apps.";
+
+const char kArcTrackpadScrollTouchscreenEmulationName[] =
+    "Enable trackpad scroll compatibility logic on specific ARC apps.";
+const char kArcTrackpadScrollTouchscreenEmulationDesc[] =
+    "Enable trackpad scroll compatibility logic on specific ARC apps.";
+
 const char kArcVmmSwapKBShortcutName[] =
     "Keyboard shortcut trigger for ARCVM"
     " vmm swap feature";