libgui: Prepare for IGBC::BufferItem removal

Switches some dependencies from IGraphicBufferConsumer::BufferItem to
android::BufferItem and adds some methods to facilitate incrementally
changing client code to do the same.

Change-Id: I699ed0a6837076867ca756b28d1ffb2238f7a0d9
diff --git a/libs/gui/GLConsumer.cpp b/libs/gui/GLConsumer.cpp
index 21bb4c4..d256ae5 100644
--- a/libs/gui/GLConsumer.cpp
+++ b/libs/gui/GLConsumer.cpp
@@ -29,6 +29,7 @@
 
 #include <hardware/hardware.h>
 
+#include <gui/BufferItem.h>
 #include <gui/GLConsumer.h>
 #include <gui/IGraphicBufferAlloc.h>
 #include <gui/ISurfaceComposer.h>
@@ -210,7 +211,7 @@
         return err;
     }
 
-    BufferQueue::BufferItem item;
+    BufferItem item;
 
     // Acquire the next buffer.
     // In asynchronous mode the list is guaranteed to be one buffer
@@ -342,7 +343,7 @@
     return sReleasedTexImageBuffer;
 }
 
-status_t GLConsumer::acquireBufferLocked(BufferQueue::BufferItem *item,
+status_t GLConsumer::acquireBufferLocked(BufferItem *item,
         nsecs_t presentWhen) {
     status_t err = ConsumerBase::acquireBufferLocked(item, presentWhen);
     if (err != NO_ERROR) {
@@ -360,6 +361,17 @@
     return NO_ERROR;
 }
 
+status_t GLConsumer::acquireBufferLocked(BufferQueue::BufferItem *outItem,
+        nsecs_t presentWhen) {
+    BufferItem item;
+    status_t result = acquireBufferLocked(&item, presentWhen);
+    if (result != NO_ERROR) {
+        return result;
+    }
+    *outItem = item;
+    return NO_ERROR;
+}
+
 status_t GLConsumer::releaseBufferLocked(int buf,
         sp<GraphicBuffer> graphicBuffer,
         EGLDisplay display, EGLSyncKHR eglFence) {