Banish DisplayID from the SurfaceFlinger API.

Use only display tokens in the API to refer to new displays.

Don't require the caller to specify the display when creating
a surface (since in general a surface could be shown on
any display).

This is intended to be a minimum change just to update the API.
Note that SurfaceFlinger still uses DisplayID in a few places
internally that might cause some features not to work properly
when there are multiple displays (LayerScreenshot, for example).

Change-Id: I3d91eec2da406eefd97bcd53655d403ad865a7e6
diff --git a/services/surfaceflinger/Client.h b/services/surfaceflinger/Client.h
index 9bfee72..d6c6931 100644
--- a/services/surfaceflinger/Client.h
+++ b/services/surfaceflinger/Client.h
@@ -54,7 +54,7 @@
     // ISurfaceComposerClient interface
     virtual sp<ISurface> createSurface(
             surface_data_t* params, const String8& name,
-            DisplayID display, uint32_t w, uint32_t h,PixelFormat format,
+            uint32_t w, uint32_t h,PixelFormat format,
             uint32_t flags);
 
     virtual status_t destroySurface(SurfaceID surfaceId);