pdfviewer: improve memory usage, improve parse time (by 30-50%) and don't allocate extra buffers (more to do, but low priority now), and put the page specific memory in an allocator.

Review URL: https://codereview.chromium.org/19793011

git-svn-id: http://skia.googlecode.com/svn/trunk@10282 2bbb7eff-a529-9590-31e7-b0007b416f81
12 files changed