[webkit-reviews] review granted: [Bug 90445] Add a comment in order to clarify why BitmapImage::frameHasAlphaAtIndex returns true as default. : [Attachment 150704] patch v.3

[bugzilla-daemon at webkit.org]

Eric Seidel <eric at webkit.org> has granted Huang Dongsung
<luxtella at company100.net>'s request for review:
Bug 90445: Add a comment in order to clarify why
BitmapImage::frameHasAlphaAtIndex returns true as default.
https://bugs.webkit.org/show_bug.cgi?id=90445

Attachment 150704: patch v.3
https://bugs.webkit.org/attachment.cgi?id=150704&action=review