Comment #17 on issue 12176 by tony.chromium: hung renderer dialog appearing  
while javascript alert is showing
http://code.google.com/p/chromium/issues/detail?id=12176

I lied about having the fix today.  I'll write down what I know:

To repro, you need two tabs in the same process (but different windows).   
Open a
javascript alert in one tab, then mouse over the second tab. This will  
cause the hung
renderer dialog to show.

The javascript alert is a sync IPC from renderer to browser.  Because of  
this, when
an input event occurs in the second tab, it gets stuck because the  
javascript alert.
On Windows, this works because they call set_pump_messages_event which  
allows the
renderer to still pump messages.

I'll look at this more on Monday.

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