use conics

BUG=skia:

Review URL: https://codereview.chromium.org/455043002
rebaseline after perspective fix (using conics)

BUG=skia:
TBR=
NOTRY=True

Review URL: https://codereview.chromium.org/811123003
remove flags that are now in chrome's userconfig

BUG=skia:

Review URL: https://codereview.chromium.org/809073002
Stop calling flushGLState in onStencilPath

Review URL: https://codereview.chromium.org/805293003
rebaseline after perspective/conic fix

BUG=skia:
TBR=
NOTRY=True

Review URL: https://codereview.chromium.org/785333004