Merge "Update dirty regions when requested to repaint everything" into pi-dev

void SurfaceFlinger::repaintEverythingLocked() {

    android_atomic_or(1, &mRepaintEverything);

    for (size_t dpy = 0; dpy < mDisplays.size(); dpy++) {

        const sp<DisplayDevice>& displayDevice(mDisplays[dpy]);

        const Rect bounds(displayDevice->getBounds());

        displayDevice->dirtyRegion.orSelf(Region(bounds));

    }

    signalTransaction();

}