Add dump_record to make inspecting before/after SkRecordOptimize easy.

Add dump_record to make inspecting before/after SkRecordOptimize easy.

E.g.
dump_record -r http___groupcloned_com_test_plain_list_animation_simple_html_layer_109.skp

 0 Save
 1 	DrawRect
 2 	DrawRect
 3 	DrawRect
 4 	DrawRect
 5 	Save
 6 		ClipRect
 7 	Restore
 8 	Save
 9 		ClipRect
10 	Restore
11 Restore

dump_record -O -r http___groupcloned_com_test_plain_list_animation_simple_html_layer_109.skp
 0 Save
 1 	DrawRect
 2 	DrawRect
 3 	DrawRect
 4 	DrawRect
 5 	NoOp
 6 	NoOp
 7 	NoOp
 8 	NoOp
 9 	NoOp
10 	NoOp
11 Restore

(Reitveld sadly eats my kickass indentation.)

BUG=skia:2378
Committed: http://code.google.com/p/skia/source/detail?r=14596

Committed: http://code.google.com/p/skia/source/detail?r=14600

[f(malita), 2014-05-06 19:37:54]

lgtm

[mtklein, 2014-05-06 19:38:38]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-05-06 19:39:08]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/265983007/20001

[commit-bot: I haz the power, 2014-05-06 19:45:21]

Change committed as 14596

[mtklein, 2014-05-06 20:31:19]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-05-06 20:31:57]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/265983007/30001

[commit-bot: I haz the power, 2014-05-06 20:38:26]

Change committed as 14600