libgui: Add a BufferItem overload to IGBC::acquire

Adds an overload of IGraphicBufferConsumer::acquireBuffer which takes
an android::BufferItem instead of an IGBC::BufferItem.

Change-Id: I9c3bc8037fa9438d4d9080b8afb694219ef2f71f
diff --git a/libs/gui/IGraphicBufferConsumer.cpp b/libs/gui/IGraphicBufferConsumer.cpp
index f38abbe..edf4408 100644
--- a/libs/gui/IGraphicBufferConsumer.cpp
+++ b/libs/gui/IGraphicBufferConsumer.cpp
@@ -23,6 +23,7 @@
 #include <binder/Parcel.h>
 #include <binder/IInterface.h>
 
+#include <gui/BufferItem.h>
 #include <gui/IConsumerListener.h>
 #include <gui/IGraphicBufferConsumer.h>
 
@@ -237,6 +238,21 @@
         return reply.readInt32();
     }
 
+    virtual status_t acquireBuffer(android::BufferItem* buffer,
+            nsecs_t presentWhen) {
+        if (buffer == nullptr) {
+            return BAD_VALUE;
+        }
+
+        BufferItem item;
+        status_t result = acquireBuffer(&item, presentWhen);
+        if (result != NO_ERROR) {
+            return result;
+        }
+        *buffer = item;
+        return NO_ERROR;
+    }
+
     virtual status_t detachBuffer(int slot) {
         Parcel data, reply;
         data.writeInterfaceToken(IGraphicBufferConsumer::getInterfaceDescriptor());