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diff --git a/widget/gonk/libdisplay/DisplaySurface.h b/widget/gonk/libdisplay/DisplaySurface.h
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+++ b/widget/gonk/libdisplay/DisplaySurface.h
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+/*
+ * Copyright 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_SF_DISPLAY_SURFACE_H
+#define ANDROID_SF_DISPLAY_SURFACE_H
+
+#include <gui/ConsumerBase.h>
+#include <system/window.h>
+#include <utils/Errors.h>
+#include <utils/RefBase.h>
+#include <utils/StrongPointer.h>
+
+// ---------------------------------------------------------------------------
+namespace android {
+// ---------------------------------------------------------------------------
+
+class IGraphicBufferProducer;
+class String8;
+
+#if ANDROID_VERSION >= 21
+typedef IGraphicBufferConsumer StreamConsumer;
+#else
+typedef BufferQueue StreamConsumer;
+#endif
+
+class DisplaySurface : public ConsumerBase {
+public:
+    // beginFrame is called at the beginning of the composition loop, before
+    // the configuration is known. The DisplaySurface should do anything it
+    // needs to do to enable HWComposer to decide how to compose the frame.
+    // We pass in mustRecompose so we can keep VirtualDisplaySurface's state
+    // machine happy without actually queueing a buffer if nothing has changed.
+    virtual status_t beginFrame(bool mustRecompose) = 0;
+
+    // prepareFrame is called after the composition configuration is known but
+    // before composition takes place. The DisplaySurface can use the
+    // composition type to decide how to manage the flow of buffers between
+    // GLES and HWC for this frame.
+    enum CompositionType {
+        COMPOSITION_UNKNOWN = 0,
+        COMPOSITION_GLES    = 1,
+        COMPOSITION_HWC     = 2,
+        COMPOSITION_MIXED   = COMPOSITION_GLES | COMPOSITION_HWC
+    };
+    virtual status_t prepareFrame(CompositionType compositionType) = 0;
+
+    // Should be called when composition rendering is complete for a frame (but
+    // eglSwapBuffers hasn't necessarily been called). Required by certain
+    // older drivers for synchronization.
+    // TODO: Remove this when we drop support for HWC 1.0.
+    virtual status_t compositionComplete() = 0;
+
+    // Inform the surface that GLES composition is complete for this frame, and
+    // the surface should make sure that HWComposer has the correct buffer for
+    // this frame. Some implementations may only push a new buffer to
+    // HWComposer if GLES composition took place, others need to push a new
+    // buffer on every frame.
+    //
+    // advanceFrame must be followed by a call to  onFrameCommitted before
+    // advanceFrame may be called again.
+    virtual status_t advanceFrame() = 0;
+
+    // onFrameCommitted is called after the frame has been committed to the
+    // hardware composer. The surface collects the release fence for this
+    // frame's buffer.
+    virtual void onFrameCommitted() = 0;
+
+    virtual void resizeBuffers(const uint32_t w, const uint32_t h) = 0;
+
+    // setReleaseFenceFd stores a fence file descriptor that will signal when the
+    // current buffer is no longer being read. This fence will be returned to
+    // the producer when the current buffer is released by updateTexImage().
+    // Multiple fences can be set for a given buffer; they will be merged into
+    // a single union fence. The SurfaceTexture will close the file descriptor
+    // when finished with it.
+    virtual status_t setReleaseFenceFd(int fenceFd) = 0;
+
+    virtual int GetPrevDispAcquireFd() = 0;
+
+    buffer_handle_t lastHandle;
+
+protected:
+    DisplaySurface(const sp<StreamConsumer>& sc)
+#if ANDROID_VERSION >= 19
+        : ConsumerBase(sc, true)
+#else
+        : ConsumerBase(sc)
+#endif
+        , lastHandle(0)
+    { }
+    virtual ~DisplaySurface() {}
+};
+
+// ---------------------------------------------------------------------------
+} // namespace android
+// ---------------------------------------------------------------------------
+
+#endif // ANDROID_SF_DISPLAY_SURFACE_H
+