mac: Use transparent window
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@ -314,6 +314,13 @@ NativeWindowMac::NativeWindowMac(content::WebContents* web_contents,
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[[AtomNSWindowDelegate alloc] initWithShell:this];
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[window_ setDelegate:delegate];
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if (transparent_) {
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// Make window has transparent background.
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[window_ setOpaque:NO];
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[window_ setHasShadow:NO];
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[window_ setBackgroundColor:[NSColor clearColor]];
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}
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// We will manage window's lifetime ourselves.
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[window_ setReleasedWhenClosed:NO];
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