[Rlog10] ResearchLogger change visible indicator to just lines on the side

(Note: Rlog9 was abandoned).

Change-Id: I69de4116e33d3c79216e25efe2ad2bcb2780b0ff

java/src/com/android/inputmethod/research/ResearchLogger.java

@@ -643,7 +643,8 @@ public class ResearchLogger implements SharedPreferences.OnSharedPreferenceChang
             final float savedStrokeWidth = paint.getStrokeWidth();
             if (IS_SHOWING_INDICATOR_CLEARLY) {
                 paint.setStrokeWidth(5);
-                canvas.drawRect(0, 0, width, height, paint);
+                canvas.drawLine(0, 0, 0, height, paint);
+                canvas.drawLine(width, 0, width, height, paint);
             } else {
                 // Put a tiny red dot on the screen so a knowledgeable user can check whether
                 // it is enabled.  The dot is actually a zero-width, zero-height rectangle,