[Android] Java Bridge with Gin: implement Java bound object

[Android] Java Bridge with Gin: implement Java bound object

This patch adds implementation for GinJavaBoundObject class, which
is responsible for interacting with injected Java objects, and a helper
trivial class GinJavaBoundObjectDelegate which is used with GinJavaMethodInvocationHelper

Java interaction code is mostly taken from the existing implementation.
The main difference that the new implementation has, is that the relationship
between Java objects and JavaScript interface objects is now managed
by us, not by NPAPI.

This patch also contains the following fixes to the existing code
discovered after re-running tests:

 -- ART doesn't like when static Java methods are invoked using JNI calls
    for instance methods, so switched to use the right JNI calls;

 -- accessing 'window' object when adding JavaScript interface objects
    may cause DidClearWindowObject to be called, so guard against double
    entrance.

BUG=355644
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278214

[mnaganov (inactive), 2014-06-12 15:09:34]

Hi Torne,

The next chunk of Gin Java bridge. I think, it's simpler than the previous one
:)

[mnaganov (inactive), 2014-06-18 14:56:14]

Ping?

[Torne, 2014-06-18 16:24:56]

LGTM. This still isn't actually hooked up to anything, right?

[mnaganov (inactive), 2014-06-18 16:41:18]

On 2014/06/18 16:24:56, Torne wrote:
> LGTM. This still isn't actually hooked up to anything, right?

Yup, not yet. There is one more big patch with another class coming, and after
that we will be able to actually hook it up.

[mnaganov (inactive), 2014-06-18 16:57:34]

The CQ bit was checked by mnaganov@chromium.org

[commit-bot: I haz the power, 2014-06-18 16:58:14]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mnaganov@chromium.org/323403007/20001

[commit-bot: I haz the power, 2014-06-19 01:10:25]

Change committed as 278214