Fix Android keyboard showing detection

ui/android/java/src/org/chromium/ui/UiUtils.java

Index: ui/android/java/src/org/chromium/ui/UiUtils.java
diff --git a/ui/android/java/src/org/chromium/ui/UiUtils.java b/ui/android/java/src/org/chromium/ui/UiUtils.java
index c9c7c0c80dd3fbd1dfcd6dd413d18a12041d6e95..6e6bf54784331764638baff1a54c14ab81cb2bd4 100644
--- a/ui/android/java/src/org/chromium/ui/UiUtils.java
+++ b/ui/android/java/src/org/chromium/ui/UiUtils.java
@@ -59,10 +59,10 @@ public class UiUtils {
         if (rootView == null) return false;
         Rect appRect = new Rect();
         rootView.getWindowVisibleDisplayFrame(appRect);
-        final float screenHeight = context.getResources().getDisplayMetrics().heightPixels;
-        final float bottomMargin = Math.abs(appRect.bottom - screenHeight);
+
         final float density = context.getResources().getDisplayMetrics().density;
-        return bottomMargin > KEYBOARD_DETECT_BOTTOM_THRESHOLD_DP * density;
+        final float bottomMarginDp = Math.abs(rootView.getHeight() - appRect.height()) / density;
+        return bottomMarginDp > KEYBOARD_DETECT_BOTTOM_THRESHOLD_DP;
     }
 
     /**