[ios Mojo] Enabled Mojo WebUI by default.

[ios Mojo] Enabled Mojo WebUI by default.

On all platforms except iOS Mojo API is implemented natively. On iOS
Chrome is not allowed to use Blink and uses WKWebView. So the only way
to implement Mojo API is hybrid approach:
 - API frontend is implemented in JS;
 - frontend packs function name and arguments into JSON and sends to
   the native code;
 - window.prompt is used as communication channel, because this is the
   only way to send synchronous message from WKWebView;
 - native code will pass JSON to facade;
 - facade will respond with JSON;
 - native code will send JSON back to JS via window.prompt result;
 - JS frontend will unpack JSON and will return the result to the caller;

This CL introduces a facade class which takes JSON as in input, passes
it to Mojo and then returns the result as JSON.

Design doc:
https://docs.google.com/document/d/1iUJXX_zoY2BbnecpfxjznOeasf29KUzl_9S_LG08Bes/edit#heading=h.yjqp5garsqf9

BUG=567809
Committed: https://crrev.com/b0bdc55356ab6ad213553ddd32ca82dc2bebd1b7
Cr-Commit-Position: refs/heads/master@{#403864}

[Eugene But (OOO till 7-30), 2016-06-01 05:55:34]

The CQ bit was checked by eugenebut@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-06-01 05:55:48]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2027733003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2027733003/1

[commit-bot: I haz the power, 2016-06-01 06:45:03]

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

[commit-bot: I haz the power, 2016-06-01 06:45:04]

Dry run: This issue passed the CQ dry run.

[Eugene But (OOO till 7-30), 2016-06-01 23:05:14]

Description was changed from

==========
[ios Mojo] Enabled Mojo WebUI by default.

BUG=
==========

to

==========
[ios Mojo] Enabled Mojo WebUI by default.

On all platforms except iOS Mojo API is implemented natively. On iOS
Chrome is not allowed to use Bling and uses WKWebView. So the only way
to implement Mojo API is hybrid approach:
 - API frontent is implemented in JS;
 - frontend packs function name and arguments into JSON and sends to
   the native code;
 - window.prompt is used as communication channel, because this is the
   only way to send synchronous message from WKWebView;
 - native code will pass JSON to facade;
 - facade will respond with JSON;
 - native code will send JSON back to JS via window.prompt result;
 - JS frontend will unpack JSON and will return the result to the caller;

This CL introduces a facade class which takes JSON as in input, passes
it to Mojo and then returns the result as JSON.

Design doc:
https://docs.google.com/document/d/1iUJXX_zoY2BbnecpfxjznOeasf29KUzl_9S_LG08B...

BUG=567809
==========

[Eugene But (OOO till 7-30), 2016-06-28 00:58:26]

eugenebut@chromium.org changed reviewers:
+ jyquinn@chromium.org

[Eugene But (OOO till 7-30), 2016-06-28 00:58:27]

Got approval to land this after M53 branch. Please do *not* CQ if this look good
to you :)

[Jackie Quinn, 2016-06-28 07:41:35]

Are we not planning on using a flag for this?

A few typos in the description (s/Bling/Blink, s/frontent/frontend), but
otherwise lgtm

[Eugene But (OOO till 7-30), 2016-06-28 13:59:20]

Description was changed from

==========
[ios Mojo] Enabled Mojo WebUI by default.

On all platforms except iOS Mojo API is implemented natively. On iOS
Chrome is not allowed to use Bling and uses WKWebView. So the only way
to implement Mojo API is hybrid approach:
 - API frontent is implemented in JS;
 - frontend packs function name and arguments into JSON and sends to
   the native code;
 - window.prompt is used as communication channel, because this is the
   only way to send synchronous message from WKWebView;
 - native code will pass JSON to facade;
 - facade will respond with JSON;
 - native code will send JSON back to JS via window.prompt result;
 - JS frontend will unpack JSON and will return the result to the caller;

This CL introduces a facade class which takes JSON as in input, passes
it to Mojo and then returns the result as JSON.

Design doc:
https://docs.google.com/document/d/1iUJXX_zoY2BbnecpfxjznOeasf29KUzl_9S_LG08B...

BUG=567809
==========

to

==========
[ios Mojo] Enabled Mojo WebUI by default.

On all platforms except iOS Mojo API is implemented natively. On iOS
Chrome is not allowed to use Blink and uses WKWebView. So the only way
to implement Mojo API is hybrid approach:
 - API frontend is implemented in JS;
 - frontend packs function name and arguments into JSON and sends to
   the native code;
 - window.prompt is used as communication channel, because this is the
   only way to send synchronous message from WKWebView;
 - native code will pass JSON to facade;
 - facade will respond with JSON;
 - native code will send JSON back to JS via window.prompt result;
 - JS frontend will unpack JSON and will return the result to the caller;

This CL introduces a facade class which takes JSON as in input, passes
it to Mojo and then returns the result as JSON.

Design doc:
https://docs.google.com/document/d/1iUJXX_zoY2BbnecpfxjznOeasf29KUzl_9S_LG08B...

BUG=567809
==========

[Eugene But (OOO till 7-30), 2016-06-28 14:00:54]

Thanks! Other platforms do not use flag for this so I don't think that we
should. There is no UI change for the change it's just implementation details.

[Eugene But (OOO till 7-30), 2016-07-06 06:09:40]

The CQ bit was checked by eugenebut@chromium.org

[commit-bot: I haz the power, 2016-07-06 06:09:50]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-06 07:51:01]

Description was changed from

==========
[ios Mojo] Enabled Mojo WebUI by default.

On all platforms except iOS Mojo API is implemented natively. On iOS
Chrome is not allowed to use Blink and uses WKWebView. So the only way
to implement Mojo API is hybrid approach:
 - API frontend is implemented in JS;
 - frontend packs function name and arguments into JSON and sends to
   the native code;
 - window.prompt is used as communication channel, because this is the
   only way to send synchronous message from WKWebView;
 - native code will pass JSON to facade;
 - facade will respond with JSON;
 - native code will send JSON back to JS via window.prompt result;
 - JS frontend will unpack JSON and will return the result to the caller;

This CL introduces a facade class which takes JSON as in input, passes
it to Mojo and then returns the result as JSON.

Design doc:
https://docs.google.com/document/d/1iUJXX_zoY2BbnecpfxjznOeasf29KUzl_9S_LG08B...

BUG=567809
==========

to

==========
[ios Mojo] Enabled Mojo WebUI by default.

On all platforms except iOS Mojo API is implemented natively. On iOS
Chrome is not allowed to use Blink and uses WKWebView. So the only way
to implement Mojo API is hybrid approach:
 - API frontend is implemented in JS;
 - frontend packs function name and arguments into JSON and sends to
   the native code;
 - window.prompt is used as communication channel, because this is the
   only way to send synchronous message from WKWebView;
 - native code will pass JSON to facade;
 - facade will respond with JSON;
 - native code will send JSON back to JS via window.prompt result;
 - JS frontend will unpack JSON and will return the result to the caller;

This CL introduces a facade class which takes JSON as in input, passes
it to Mojo and then returns the result as JSON.

Design doc:
https://docs.google.com/document/d/1iUJXX_zoY2BbnecpfxjznOeasf29KUzl_9S_LG08B...

BUG=567809
==========

[commit-bot: I haz the power, 2016-07-06 07:51:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-06 07:51:08]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-07-06 07:52:49]

Description was changed from

==========
[ios Mojo] Enabled Mojo WebUI by default.

On all platforms except iOS Mojo API is implemented natively. On iOS
Chrome is not allowed to use Blink and uses WKWebView. So the only way
to implement Mojo API is hybrid approach:
 - API frontend is implemented in JS;
 - frontend packs function name and arguments into JSON and sends to
   the native code;
 - window.prompt is used as communication channel, because this is the
   only way to send synchronous message from WKWebView;
 - native code will pass JSON to facade;
 - facade will respond with JSON;
 - native code will send JSON back to JS via window.prompt result;
 - JS frontend will unpack JSON and will return the result to the caller;

This CL introduces a facade class which takes JSON as in input, passes
it to Mojo and then returns the result as JSON.

Design doc:
https://docs.google.com/document/d/1iUJXX_zoY2BbnecpfxjznOeasf29KUzl_9S_LG08B...

BUG=567809
==========

to

==========
[ios Mojo] Enabled Mojo WebUI by default.

On all platforms except iOS Mojo API is implemented natively. On iOS
Chrome is not allowed to use Blink and uses WKWebView. So the only way
to implement Mojo API is hybrid approach:
 - API frontend is implemented in JS;
 - frontend packs function name and arguments into JSON and sends to
   the native code;
 - window.prompt is used as communication channel, because this is the
   only way to send synchronous message from WKWebView;
 - native code will pass JSON to facade;
 - facade will respond with JSON;
 - native code will send JSON back to JS via window.prompt result;
 - JS frontend will unpack JSON and will return the result to the caller;

This CL introduces a facade class which takes JSON as in input, passes
it to Mojo and then returns the result as JSON.

Design doc:
https://docs.google.com/document/d/1iUJXX_zoY2BbnecpfxjznOeasf29KUzl_9S_LG08B...

BUG=567809

Committed: https://crrev.com/b0bdc55356ab6ad213553ddd32ca82dc2bebd1b7
Cr-Commit-Position: refs/heads/master@{#403864}
==========

[commit-bot: I haz the power, 2016-07-06 07:52:50]

Patchset 1 (id:??) landed as
https://crrev.com/b0bdc55356ab6ad213553ddd32ca82dc2bebd1b7
Cr-Commit-Position: refs/heads/master@{#403864}