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FrameBuffer::GetStatus() was spending most of the time doing in printf,
I've modified it to generate signatures using a binary representation
instead. Now most of the time is spent allocating memory. If further
optimization is necessary we can precalculate the signature size
as well.

BUG= https://code.google.com/p/chromium/issues/detail?id=338035
TEST= profile FrameBuffer::GetStatus()

Review URL: https://codereview.chromium.org/593233002

Cr-Commit-Position: refs/heads/master@{#297209}