[rfc][icedtea-web] Fix for PR1198, JSObject passed incorrectly to Javascript

[Adam Domurad]

Hi all. Attached is a fix for PR1198.

I still plan to write unit tests for at least the new method 
PluginAppletViewer.toObjectIDString, but I wanted to get this out before 
leaving for the weekend.

One tricky thing with this patch was that it had to consolidate _a lot_ 
of duplicated functionality (actually I found some subtle differences in 
handling, this should be more consistent). Once that was done the actual 
patch was fairly straight forward.

The basic issue was that JSObject was being passed as if it were a 
normal Java object, when the liveconnect spec specifies that it should 
be returned as the underlying javascript object.

A method was added to JSObject to get the underlying reference. This was 
kept package-private to not pollute its public interface. As well, a new 
permission was added for accessing this method. To access this outside 
of the package, a utility was created in JSUtil.

This patch adds a special case to Java->JS communication when sending 
objects, to indicate that a Javascript object is being passed.

With patch applied, JSObjectFromEval should pass in all browsers.

2012-11-30  Adam Domurad  <adomurad at redhat.com>

     Fix PR1198: JSObject passed incorrectly to Javascript
     * plugin/icedteanp/IcedTeaJavaRequestProcessor.cc: Pass extra data for
     'jsobject' object result messages.
     * plugin/icedteanp/IcedTeaPluginRequestProcessor.cc: Same.
     * plugin/icedteanp/IcedTeaPluginUtils.cc: Add special casing of
     javascript references passed from java.
     * 
plugin/icedteanp/java/netscape/javascript/JSObjectUnboxPermission.java:
     New permission for unboxing a JSObject's internal reference.
     * plugin/icedteanp/java/netscape/javascript/JSObject.java
     (getInternalReference): New, package-private, retrieves internal
     reference (Must have proper permission).
     * plugin/icedteanp/java/netscape/javascript/JSUtil.java
     (getJSObjectInternalReference) New, utility for accessing
     JSObject#getInternalReference from outside the package.
     * plugin/icedteanp/java/sun/applet/PluginAppletSecurityContext.java:
     (toObjectIDString): New, creates a string that precisely identifies a
     Java object.
     (handleMessage): Replace a lot of duplicated functionality with
     'toObjectIDString'.
     * plugin/icedteanp/java/sun/applet/PluginAppletViewer.java: Replace
     duplicated functionality with 'toObjectIDString'.
     * tests/reproducers/simple/JSObjectFromEval/srcs/JSObjectFromEval.java:
     Don't print out type passed (differs from browser to browser).
     * 
tests/reproducers/simple/JSObjectFromEval/testcases/JSObjectFromEvalTest.java:
     Don't check type passed (differs from browser to browser). Remove
     known-to-fail. Reformat.
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