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its current position is at a segment boundary (4096) ends up adding an
unitialized segment (with uninitialized memory) to the SharedBuffer.
https://bugs.webkit.org/show_bug.cgi?id=99000

Reviewed by Adam Barth.

Source/WebCore:

* platform/SharedBuffer.cpp:
(WebCore::SharedBuffer::append):

LayoutTests:

* mhtml/shared_buffer_bug-expected.txt: Added.
* mhtml/shared_buffer_bug.mht: Added.


git-svn-id: svn://svn.chromium.org/blink/trunk@131315 bbb929c8-8fbe-4397-9dbb-9b2b20218538