SurfaceMediaSource: use the vid enc usage bit

This change makes SurfaceMediaSource add the VIDEO_ENC usage bit when
allocating its GraphicBuffers rather than the HW_TEXTURE bit.

Change-Id: Ie20e225c894fdbc31cad6bb82b3b64c7e98074eb
diff --git a/media/libstagefright/SurfaceMediaSource.cpp b/media/libstagefright/SurfaceMediaSource.cpp
index 2b27ee2..86b33d1 100644
--- a/media/libstagefright/SurfaceMediaSource.cpp
+++ b/media/libstagefright/SurfaceMediaSource.cpp
@@ -336,7 +336,7 @@
         (uint32_t(buffer->height) != h) ||
         (uint32_t(buffer->format) != format) ||
         ((uint32_t(buffer->usage) & usage) != usage)) {
-            usage |= GraphicBuffer::USAGE_HW_TEXTURE;
+            usage |= GraphicBuffer::USAGE_HW_VIDEO_ENCODER;
             status_t error;
             sp<GraphicBuffer> graphicBuffer(
                     mGraphicBufferAlloc->createGraphicBuffer(