Fix blank page issues caused by too strict check

Fix blank page issues caused by too strict check

Before this fix, PDF parser aborts the parsering process when detecting an error.
For this case, PDF parser just gives up parsering when it detects that the length of
image stream is incorrect. The solution to this case is to find the tag "endstream"
and "endobj" to calculate the length rather than aborting the parsering process.

BUG=433339
R=tsepez@chromium.org

Committed: https://pdfium.googlesource.com/pdfium/+/ef619d0562b39f30943cfdc4985a0df233d00e42

[jun_fang, 2014-11-20 19:03:39]

jun_fang@foxitsoftware.com changed reviewers:
+ bo_xu@foxitsoftware.com, tsepez@chromium.org

[jun_fang, 2014-11-20 19:03:39]

Hi guys, please review this change. Thanks!

[Tom Sepez, 2014-11-20 19:09:13]

lgtm

[jun_fang, 2014-11-20 21:43:50]

Committed patchset #1 (id:1) manually as
ef619d0562b39f30943cfdc4985a0df233d00e42 (presubmit successful).