Add C++11 enum class support to the Java enum class generator.

Add C++11 enum class support to the Java enum class generator.

This adds support for the enum class/struct construct as well as limited
support for fixed types (currently only types that convert to jint are
supported).

BUG=None
TESTS=java_cpp_enum_tests

Committed: https://crrev.com/7fd46f236b16d0dee58a8e0f007029912dea4d9f
Cr-Commit-Position: refs/heads/master@{#303332}

[mkosiba (inactive), 2014-11-07 05:07:43]

mkosiba@chromium.org changed reviewers:
+ cjhopman@chromium.org, jdduke@chromium.org

[jdduke (slow), 2014-11-07 16:03:34]

<24 hour turnaround time, you're my hero. As a non-owner not super familiar with
this code, lgtm (i.e., let's wait for cjhopman@'s review :)

[cjhopman, 2014-11-07 22:31:10]

lgtm

[mkosiba (inactive), 2014-11-07 22:51:02]

The CQ bit was checked by mkosiba@chromium.org

[commit-bot: I haz the power, 2014-11-07 22:52:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/705093005/1

[commit-bot: I haz the power, 2014-11-08 00:14:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-08 00:15:46]

Patchset 1 (id:??) landed as
https://crrev.com/7fd46f236b16d0dee58a8e0f007029912dea4d9f
Cr-Commit-Position: refs/heads/master@{#303332}