update surfaceflinger, libui and libagl to the new gralloc api

- Currently the lock/unlock path is naive and is done for each drawing operation (glDrawElements and glDrawArrays). this should be improved eventually.
- factor all the lock/unlock code in SurfaceBuffer.
- fixed "showupdate" so it works even when we don't have preserving eglSwapBuffers().
- improved the situation with the dirty-region and fixed a problem that caused GL apps to not update.
- make use of LightRefBase() where needed, instead of duplicating its implementation
- add LightRefBase::getStrongCount()
- renamed EGLNativeWindowSurface.cpp to FramebufferNativeWindow.cpp

- disabled copybits test, since it clashes with the new gralloc api

- Camera/Video will be fixed later when we rework the overlay apis
diff --git a/libs/ui/Region.cpp b/libs/ui/Region.cpp
index 26e694a..30da911 100644
--- a/libs/ui/Region.cpp
+++ b/libs/ui/Region.cpp
@@ -88,6 +88,13 @@
     mRegion.setRect(ir);
 }
 
+void Region::set(uint32_t w, uint32_t h)
+{
+    SkIRect ir;
+    ir.set(0, 0, w, h);
+    mRegion.setRect(ir);
+}
+
 // ----------------------------------------------------------------------------
 
 Region& Region::orSelf(const Rect& r)