Trailer should be a dictionary object

BUG=https://code.google.com/p/pdfium/issues/detail?id=86

a "<<" token should follow "trailer" but "<" will trick the parser to make trailer a hex string object.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/787753002
Lab colorspace needs to be 3 component

BUG=429134
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/791223002
Do not do strict check of BitsPerComponent for RunLengthDecode filter

BUG=438421
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/790363002
Merge remote-tracking branch 'origin/master' into light_version