fix Surface positions are not floats

Added Surface.setPosition(float, float) which allows to set a surface's
position in float.

Bug: 5239859
Change-Id: I903aef4ad5b5999142202fb8ea30fe216d805711
diff --git a/include/private/surfaceflinger/LayerState.h b/include/private/surfaceflinger/LayerState.h
index d2fed41..3eb5c99 100644
--- a/include/private/surfaceflinger/LayerState.h
+++ b/include/private/surfaceflinger/LayerState.h
@@ -54,8 +54,8 @@
             };
             SurfaceID       surface;
             uint32_t        what;
-            int32_t         x;
-            int32_t         y;
+            float           x;
+            float           y;
             uint32_t        z;
             uint32_t        w;
             uint32_t        h;
diff --git a/include/surfaceflinger/SurfaceComposerClient.h b/include/surfaceflinger/SurfaceComposerClient.h
index 7fbbfb2..ace0735 100644
--- a/include/surfaceflinger/SurfaceComposerClient.h
+++ b/include/surfaceflinger/SurfaceComposerClient.h
@@ -145,7 +145,7 @@
     status_t    setAlpha(SurfaceID id, float alpha=1.0f);
     status_t    setFreezeTint(SurfaceID id, uint32_t tint);
     status_t    setMatrix(SurfaceID id, float dsdx, float dtdx, float dsdy, float dtdy);
-    status_t    setPosition(SurfaceID id, int32_t x, int32_t y);
+    status_t    setPosition(SurfaceID id, float x, float y);
     status_t    setSize(SurfaceID id, uint32_t w, uint32_t h);
     status_t    destroySurface(SurfaceID sid);