Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: unity-chromium-extension (Ubuntu Raring)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1196943
Title:
WebApps do not work w/ chromium 28
Status in Chromium extension: Unity Integration:
Fix Released
Status in “unity-chromium-extension” package in Ubuntu:
Fix Released
Status in “unity-chromium-extension” source package in Quantal:
Confirmed
Status in “unity-chromium-extension” source package in Raring:
Confirmed
Bug description:
[Impact]
Workaround for an issue with Chromium 27 and 28 and Webapps. Webapps
stopped working altogether with those chromium versions. What happened
is that any javascript callback function that was called (whatever the
stage) from chromium's internal could not access the NPAPI plugin
variable (_uwa) that is a javascript object that is a bridge to the
WebApps NPAPI plugin. Accessing the variable throws with an exception
"NPObject has been deleted" (which is not the case).
The workaround rebinds the variable for every callback to the plugin
node.
TECHNICAL DETAILS:
-----------------
There has been some changes recently in chromium 27+ around the v8
bindings' templates separated by world type (either page world or
content script private world). Although I am not sure, it seemed to
have an impact somewhere in the lookup location for V8NPObject v8
binding variables.
The "NPOBJect has been deleted" exception first occurs when webapps
callback in the context_prepare() callback (from a native NPAPI
function) that tries to call the plugin using _uwa. The variable is
just closed over in the callback but is being looked up in the v8
binding for NPAPI (npObjectInvokeImpl() in
WebCore/bindings/v8/V8NPObject.cpp) in the wrong World (page world
instead of content script world).
The V8NPObject binding for the NPAPI plugin is apparently created
properly (tagged w/ the proper world id) but somewhere along the line
(copying?) something goes wrong.
[Test Case]
1. install the unity-chromium-extension,
2. open chromium 28 and make sure that the extension is properly detected
(chrome://extensions),
3. go to e.g. facebook.com or bbc.co.uk./news,
4. make sure that a launcher icon appears and the webapps integrates
(notifications for bbc and messaging menu for facebook),
[Regression Potential]
None since the fix is strictly confined in the webapps extension and
webapps are currently broken.
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