Rename ColorLayer to EffectLayer to handle both shadows and color fill

We want the ability for a layer to render shadows without any content.
This new layer type will be able to combine effects as needed.

Test: presubmit tests (no functional changes)
Test: go/wm-smoke
Change-Id: I8663d126a23263a3d7dc799d39a9cf44b3b6e4a0
diff --git a/services/surfaceflinger/BufferStateLayer.cpp b/services/surfaceflinger/BufferStateLayer.cpp
index 923a81c..6e0d13a 100644
--- a/services/surfaceflinger/BufferStateLayer.cpp
+++ b/services/surfaceflinger/BufferStateLayer.cpp
@@ -32,7 +32,7 @@
 #include <private/gui/SyncFeatures.h>
 #include <renderengine/Image.h>
 
-#include "ColorLayer.h"
+#include "EffectLayer.h"
 #include "FrameTracer/FrameTracer.h"
 #include "TimeStats/TimeStats.h"