Fixed display size on coversRegion test

Currently the test fails on cuttlefish because of different screen resolution with the following error:

expected to contain:
    Region to test: SkRegion((0,0,1440,2960))
but was:
    Region to test: SkRegion((0,0,720,1280))

Test: atest FlickerLibTest
Change-Id: I672369dcd0bb961c602bb4eb1f5d2d87c7ed5a78
diff --git a/libraries/flicker/test/src/com/android/server/wm/flicker/LayersTraceTest.java b/libraries/flicker/test/src/com/android/server/wm/flicker/LayersTraceTest.java
index 7154b65..4b233c3 100644
--- a/libraries/flicker/test/src/com/android/server/wm/flicker/LayersTraceTest.java
+++ b/libraries/flicker/test/src/com/android/server/wm/flicker/LayersTraceTest.java
@@ -141,7 +141,7 @@
         LayersTrace trace = readLayerTraceFromFile("layers_trace_emptyregion.pb");
         LayerTraceEntry entry = trace.getEntry(2308008331271L);
 
-        AssertionResult result = entry.coversRegion(getDisplayBounds());
+        AssertionResult result = entry.coversRegion(new Region(0, 0, 1440, 2960));
 
         assertThat(result.failed()).isTrue();
         assertThat(result.getReason()).contains("Region to test: SkRegion((0,0,1440,2960))");