split ComposerService out of SurfaceComposerClient.h

Change-Id: I1eb691f7ca263d5895d871ab675bb5826e0323c6
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index 4ad6c22..699438c 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -39,6 +39,7 @@
 #include <private/surfaceflinger/LayerState.h>
 #include <private/surfaceflinger/SharedBufferStack.h>
 
+#include <private/gui/ComposerService.h>
 
 namespace android {
 // ---------------------------------------------------------------------------