Cherry pick "Fix allocation of context buffers on frame resize"

https://gerrit.chromium.org/gerrit/gitweb?p=webm%2Flibvpx.git;a=commit;h=423e8a9727b25d54de24630f9c042fd5bddf7c8d

Author: Adrian Grange <agrange@google.com>
Date:   Thu Jul 24 13:37:47 2014 -0700

    Fix allocation of context buffers on frame resize
    
    The patch:
    https://gerrit.chromium.org/gerrit/#/c/70814/
    changed the test that determined whether the context
    frame buffers needed to be reallocated or not.
    
    The code checked for a change in total frame area
    to signal the need to reallocate context buffers.
    However, the above_context buffer needs to be
    resized i:xf only the width of the frame has increased.
    
    Change-Id: Ib89d75651af252908144cf662578d84f16cf30e6



git-svn-id: http://src.chromium.org/svn/branches/2125/deps/third_party/libvpx@291828 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed