Add camera service support for SurfaceTexture.

This change enables the use of a SurfaceTexture in place of a Surface as
the destination of camera preview frames.

Change-Id: Ic70d404c8fe261e9d5da6f1de93d6babb5b191cb
diff --git a/include/camera/Camera.h b/include/camera/Camera.h
index c95f31e..e5f7e62 100644
--- a/include/camera/Camera.h
+++ b/include/camera/Camera.h
@@ -19,6 +19,7 @@
 
 #include <utils/Timers.h>
 #include <camera/ICameraClient.h>
+#include <gui/ISurfaceTexture.h>
 
 namespace android {
 
@@ -175,6 +176,9 @@
             // pass the buffered Surface to the camera service
             status_t    setPreviewDisplay(const sp<Surface>& surface);
 
+            // pass the buffered ISurfaceTexture to the camera service
+            status_t    setPreviewTexture(const sp<ISurfaceTexture>& surfaceTexture);
+
             // start preview mode, must call setPreviewDisplay first
             status_t    startPreview();