gralloc: Report YUV plane info

The android_ycbcr structure in graphics.h is populated to give
the luma and chroma addresses. Use the same structure to give
this information to graphics via a gralloc perform call.

Change-Id: Ib42866a9ea90873886dcb60a1aac6cb375292642
diff --git a/libgralloc/gr.h b/libgralloc/gr.h
index fbde8c2..32f3256 100644
--- a/libgralloc/gr.h
+++ b/libgralloc/gr.h
@@ -69,6 +69,7 @@
 // It is the responsibility of the caller to free the buffer
 int alloc_buffer(private_handle_t **pHnd, int w, int h, int format, int usage);
 void free_buffer(private_handle_t *hnd);
+int getYUVPlaneInfo(private_handle_t* pHnd, struct android_ycbcr* ycbcr);
 
 /*****************************************************************************/