diff -r 000000000000 -r 6474c204b198 widget/gonk/libdisplay/GonkDisplay.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/gonk/libdisplay/GonkDisplay.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,73 @@
+/* Copyright 2013 Mozilla Foundation and Mozilla contributors
+ *
+ * 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 GONKDISPLAY_H
+#define GONKDISPLAY_H
+
+#include <system/window.h>
+
+namespace mozilla {
+
+namespace layers {
+class Layer;
+}
+
+typedef void * EGLDisplay;
+typedef void * EGLSurface;
+
+class GonkDisplay {
+public:
+    virtual ANativeWindow* GetNativeWindow() = 0;
+
+    virtual void SetEnabled(bool enabled) = 0;
+
+    typedef void (*OnEnabledCallbackType)(bool enabled);
+
+    virtual void OnEnabled(OnEnabledCallbackType callback) = 0;
+
+    virtual void* GetHWCDevice() = 0;
+
+    virtual void* GetFBSurface() = 0;
+
+    virtual bool SwapBuffers(EGLDisplay dpy, EGLSurface sur) = 0;
+
+    virtual ANativeWindowBuffer* DequeueBuffer() = 0;
+
+    virtual bool QueueBuffer(ANativeWindowBuffer* buf) = 0;
+
+    virtual void UpdateFBSurface(EGLDisplay dpy, EGLSurface sur) = 0;
+
+    /**
+     * Set FramebufferSurface ReleaseFence's file descriptor.
+     * ReleaseFence will be signaled after the HWC has finished reading
+     * from a buffer.
+     */
+    virtual void SetFBReleaseFd(int fd) = 0;
+
+    /**
+     * Get FramebufferSurface AcquireFence's file descriptor
+     * AcquireFence will be signaled when a buffer's content is available.
+     */
+    virtual int GetPrevFBAcquireFd() = 0;
+
+    float xdpi;
+    uint32_t surfaceformat;
+};
+
+__attribute__ ((weak))
+GonkDisplay* GetGonkDisplay();
+
+}
+#endif /* GONKDISPLAY_H */