Is it possible to get render time per tile? Is it possible to ask blender when each render tile starts/finishes rendering?

e.g. for a render time estimator

This used to be somewhat possible from the command line:

For example in blender 2.65a the elapsed time was printed, along with what tile was being traced:

Fra:1 Mem:12.59M (9.89M, peak 27.51M) | Mem: 6.82M, Peak: 6.96M | Scene, RenderLayer | Elapsed: 00:04.28 | Rendering | Path Tracing Tile 10/135
Fra:1 Mem:12.59M (9.89M, peak 27.51M) | Mem: 6.82M, Peak: 6.96M | Scene, RenderLayer | Elapsed: 00:04.41 | Rendering | Path Tracing Tile 11/135
Fra:1 Mem:12.59M (9.89M, peak 27.51M) | Mem: 6.96M, Peak: 6.96M | Scene, RenderLayer | Elapsed: 00:04.56 | Rendering | Path Tracing Tile 12/135
Fra:1 Mem:12.59M (9.89M, peak 27.51M) | Mem: 6.82M, Peak: 6.96M | Scene, RenderLayer | Elapsed: 00:05.99 | Rendering | Path Tracing Tile 13/135


though now with later versions of blender the elapsed time is no longer printed.
while you might be able to read blender's output with a script and get the time, is this possible with python? 

Is there any way to get similar information to what is printed in the terminal with python?
from datetime import datetime
from bpy.app import handlers

TIMER = None

def start_timer(scene):
    global TIMER
    TIMER = datetime.now()

def elapsed(dummy):
    print("Elapsed:", datetime.now() - TIMER)

handlers.render_pre.append(start_timer)
handlers.render_stats.append(elapsed)


Example output:


Elapsed: 0:00:10.819869
Fra:1 Mem:7.10M (9.89M, Peak 17.07M) | Mem:1.21M, Peak:1.29M | Scene, RenderLayer | Path Tracing Tile 133/135
Elapsed: 0:00:10.863458
Fra:1 Mem:7.10M (9.89M, Peak 17.07M) | Mem:1.29M, Peak:1.29M | Scene, RenderLayer | Path Tracing Tile 134/135
Elapsed: 0:00:10.931486
Fra:1 Mem:7.10M (9.89M, Peak 17.07M) | Mem:1.21M, Peak:1.29M | Scene, RenderLayer | Path Tracing Tile 135/135
Elapsed: 0:00:11.466759
Fra:1 Mem:7.10M (9.89M, Peak 17.07M) | Mem:0.02M, Peak:1.29M | Scene, RenderLayer | Finished
Elapsed: 0:00:11.467813
Fra:1 Mem:7.08M (9.89M, Peak 17.07M) Sce: Scene Ve:0 Fa:0 La:0
Elapsed: 0:00:11.841684
Saved: /tmp/0001.png Time: 00:11.84 (Saving: 00:00.37)