Merge "Defer surfaceflinger composition until data latch" into oc-dev

    bool visibleRegions = false;

    bool frameQueued = false;

    bool newDataLatched = false;

    // Store the set of layers that need updates. This set must not change as

    // buffers are being latched, as this could result in a deadlock.

        const Region dirty(layer->latchBuffer(visibleRegions, latchTime));

        layer->useSurfaceDamage();

        invalidateLayerStack(layer->getLayerStack(), dirty);

        if (!dirty.isEmpty()) {

            newDataLatched = true;

        }

    }

    mVisibleRegionsDirty |= visibleRegions;

    }

    // Only continue with the refresh if there is actually new work to do

    return !mLayersWithQueuedFrames.empty();

    return !mLayersWithQueuedFrames.empty() && newDataLatched;

}

void SurfaceFlinger::invalidateHwcGeometry()