Make the scripting OOP PDF API easier to use (take 2)

Make the scripting OOP PDF API easier to use (take 2)

This mainly removes the need to call setParentWindow before using the API but
it also delays more messages from being received until the document is loaded
which makes the API easier to use.

BUG=415858
Committed: https://crrev.com/c121c2269073e9249c982d9ba7c3301cb6e778a7
Cr-Commit-Position: refs/heads/master@{#312722}

[raymes, 2015-01-22 04:10:57]

raymes@chromium.org changed reviewers:
+ sammc@chromium.org

[Sam McNally, 2015-01-22 06:12:12]

lgtm

https://codereview.chromium.org/870453002/diff/20001/chrome/browser/resources...
File chrome/browser/resources/pdf/pdf.js (right):

https://codereview.chromium.org/870453002/diff/20001/chrome/browser/resources...
chrome/browser/resources/pdf/pdf.js:639: case 'loadPreviewPage':
Isn't this used for print preview?

[raymes, 2015-01-22 22:20:57]

The CQ bit was checked by raymes@chromium.org

[commit-bot: I haz the power, 2015-01-22 22:25:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/870453002/40001

[commit-bot: I haz the power, 2015-01-23 00:28:21]

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

[commit-bot: I haz the power, 2015-01-23 00:28:21]

Exceeded time limit waiting for builds to trigger.

[raymes, 2015-01-23 00:29:13]

The CQ bit was checked by raymes@chromium.org

[commit-bot: I haz the power, 2015-01-23 00:30:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/870453002/40001

[commit-bot: I haz the power, 2015-01-23 01:15:17]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-01-23 01:15:53]

Patchset 3 (id:??) landed as
https://crrev.com/c121c2269073e9249c982d9ba7c3301cb6e778a7
Cr-Commit-Position: refs/heads/master@{#312722}