Bug 1671849 - Move drag threshold setting to nsLookAndFeel; r=geckoview-reviewers,snorp

Differential Revision: https://phabricator.services.mozilla.com/D93902

mobile/android/app/mobile.js

@@ -375,11 +375,6 @@ pref("app.update.url.android", "https://aus5.mozilla.org/update/4/%PRODUCT%/%VER
   pref("app.update.channel", "@MOZ_UPDATE_CHANNEL@");
 #endif
 
-// threshold where a tap becomes a drag, in 1/240" reference pixels
-// The names of the preferences are to be in sync with EventStateManager.cpp
-pref("ui.dragThresholdX", 25);
-pref("ui.dragThresholdY", 25);
-
 pref("layers.async-video.enabled", true);
 
 // APZ physics settings (fling acceleration, fling curving and axis lock) have

widget/android/nsLookAndFeel.cpp

@@ -409,6 +409,12 @@ nsresult nsLookAndFeel::GetIntImpl(IntID aID, int32_t& aResult) {
       break;
     }
 
+    case IntID::DragThresholdX:
+    case IntID::DragThresholdY:
+      // Threshold where a tap becomes a drag, in 1/240" reference pixels.
+      aResult = 25;
+      break;
+
     default:
       aResult = 0;
       rv = NS_ERROR_FAILURE;