blast: set layers to scale to window

Instead of forcing buffers to be the same size as their window,
allow the crop to scale to the display frame.

Test: Transaction_test

Change-Id: I156642ad4951c521699116b8334c92a9f7c5546f
diff --git a/services/surfaceflinger/BufferStateLayer.cpp b/services/surfaceflinger/BufferStateLayer.cpp
index 9edff21..0e14d8c 100644
--- a/services/surfaceflinger/BufferStateLayer.cpp
+++ b/services/surfaceflinger/BufferStateLayer.cpp
@@ -266,7 +266,7 @@
 }
 
 uint32_t BufferStateLayer::getDrawingScalingMode() const {
-    return NATIVE_WINDOW_SCALING_MODE_FREEZE;
+    return NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW;
 }
 
 Region BufferStateLayer::getDrawingSurfaceDamage() const {