Add type annotations to gallery/js/image_editor/filter.js.

Add type annotations to gallery/js/image_editor/filter.js.

BUG=433728
TEST=GYP_GENERATORS=ninja tools/gyp/gyp --depth . ui/file_manager/gallery/js/compiled_resources.gyp && ninja -C out/Default | grep "filter.js"

Committed: https://crrev.com/e732b712217b2652d6b1f7830d89ae4d49ce7aaf
Cr-Commit-Position: refs/heads/master@{#305787}

[yawano, 2014-11-26 01:41:54]

yawano@chromium.org changed reviewers:
+ fukino@chromium.org

[yawano, 2014-11-26 01:41:55]

@fukino: PTAL. Thanks!

[fukino, 2014-11-26 04:22:56]

On 2014/11/26 01:41:55, yawano wrote:
> @fukino: PTAL. Thanks!

lgtm. Thanks!

[yawano, 2014-11-26 04:28:29]

Thank you for the review!

[yawano, 2014-11-26 04:28:33]

The CQ bit was checked by yawano@chromium.org

[commit-bot: I haz the power, 2014-11-26 04:29:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/758343002/1

[commit-bot: I haz the power, 2014-11-26 05:12:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-26 05:13:47]

Patchset 1 (id:??) landed as
https://crrev.com/e732b712217b2652d6b1f7830d89ae4d49ce7aaf
Cr-Commit-Position: refs/heads/master@{#305787}