Initial tests for ReaderModeManager

Initial tests for ReaderModeManager

This adds the mock classes and a initial tests for the
ReaderModeManager.

BUG=

Committed: https://crrev.com/eb605d8b5552a4cb6db686f14513d002f719e367
Cr-Commit-Position: refs/heads/master@{#361226}

[mdjones, 2015-11-23 17:30:31]

mdjones@chromium.org changed reviewers:
+ dtrainor@chromium.org

[mdjones, 2015-11-23 17:30:31]

This changes adds the mock classes and only a few tests for the
ReaderModeManager; hopefully making this easier to review. TODOs will be
addressed after this change lands. PTAL

[David Trainor- moved to gerrit, 2015-11-23 21:11:06]

lgtm

[mdjones, 2015-11-23 21:23:04]

The CQ bit was checked by mdjones@chromium.org

[commit-bot: I haz the power, 2015-11-23 21:24:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1469973002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1469973002/20001

[commit-bot: I haz the power, 2015-11-23 22:26:47]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-23 22:26:51]

Try jobs failed on following builders:
  android_clang_dbg_recipe on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/android_clang_d...)

[mdjones, 2015-11-23 23:08:02]

The CQ bit was checked by mdjones@chromium.org

[mdjones, 2015-11-23 23:08:02]

The patchset sent to the CQ was uploaded after l-g-t-m from
dtrainor@chromium.org
Link to the patchset: https://codereview.chromium.org/1469973002/#ps40001
(title: "make inner class static")

[commit-bot: I haz the power, 2015-11-23 23:09:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1469973002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1469973002/40001

[commit-bot: I haz the power, 2015-11-24 00:23:55]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-11-24 00:24:42]

Patchset 3 (id:??) landed as
https://crrev.com/eb605d8b5552a4cb6db686f14513d002f719e367
Cr-Commit-Position: refs/heads/master@{#361226}