Drawing fake bold text, line and normal text made normal text bolder on PDF.

Drawing fake bold text, line and normal text made normal text bolder on PDF.

When PDF uses fake bold text, it uses stroke and fill for the
text. After that, line is drawn. It creates new ContextEntry which
GraphicStateEntry has 0 fTextScaleX. Since fTextScaleX is 0,
GraphicStackState::updateDrawingState() doesn't update text fill mode or
the PDF page. When the normal text is drawn, it reuse the line's
ContextEntry because GraphicStateEntry::compareInitialState() returns
true. However, since the reused GraphicsStateEntry's fTextScaleX is 0,
the text fill mode is not updated to fill, and the text is drawn in
stroke and fill mode.

When the fTextScaleX is changed, we should not reuse GraphicStateEntry
even if ether of fTextScaleX is 0.

BUG=skia:2132
R=reed@google.com, vandebo@chromium.org, bungeman@google.com

Author: yuki.sekiguchi@access-company.com

Review URL: https://codereview.chromium.org/137923005

git-svn-id: http://skia.googlecode.com/svn/trunk@13369 2bbb7eff-a529-9590-31e7-b0007b416f81