Revert "Revert of Expose distiller functions to JavaScript..."

Reland: Expose distiller functions to JavaScript

This change adds two mojo services; one for notifying a RenderFrame
that it is working on a distiller page and one for allowing distiller
JavaScript functions to access the browser. This CL only exposes a
single function "distiller.echo".

This reverts commit 5b77e8f46f38eb1592b17ec2e2fe97a148d96a65 and
should fix the GN build that broke.

Initial review: https://codereview.chromium.org/1231083007/

TBR=jochen

Committed: https://crrev.com/28f3694cf6796d840cb4296441d26f63c2ce50c2
Cr-Commit-Position: refs/heads/master@{#350418}

[mdjones, 2015-09-19 01:20:53]

mdjones@chromium.org changed reviewers:
+ jochen@chromium.org, nyquist@chromium.org

[mdjones, 2015-09-19 01:20:54]

My previous CL (https://codereview.chromium.org/1231083007/) had to be reverted
due to a build issue on windows. This CL reverts the revert and fixes the build
(see patch set 2).

[nyquist, 2015-09-21 02:54:51]

lgtm

Regarding the commit message, could you change it to something like:
###
Reland: Expose distiller functions to JavaScript

This change adds two mojo services; one for notifying a RenderFrame
that it is working on a distiller page and one for allowing distiller
JavaScript functions to access the browser. This CL only exposes a
single function "distiller.echo".

This reverts commit 5b77e8f46f38eb1592b17ec2e2fe97a148d96a65 and
should fix the GN build that broke.

Initial review: https://codereview.chromium.org/1231083007/
###

It's just that if this CL sticks, it's helpful to have a descriptive commit
message.

[mdjones, 2015-09-23 22:11:14]

The CQ bit was checked by mdjones@chromium.org

[mdjones, 2015-09-23 22:11:14]

The patchset sent to the CQ was uploaded after l-g-t-m from nyquist@chromium.org
Link to the patchset: https://codereview.chromium.org/1351313003/#ps40001
(title: "rebase")

[commit-bot: I haz the power, 2015-09-23 22:13:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1351313003/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1351313003/40001

[commit-bot: I haz the power, 2015-09-24 00:48:32]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-09-24 00:49:39]

Patchset 3 (id:??) landed as
https://crrev.com/28f3694cf6796d840cb4296441d26f63c2ce50c2
Cr-Commit-Position: refs/heads/master@{#350418}