Remove extra inclusion of FontFamilyNames

The Android cc unit tests build is broken due to doubly
defined FontFamilyNames, and this is all I can find that
might address the problem.

TBR=abarth
BUG=297477

Review URL: https://codereview.chromium.org/26912002

git-svn-id: svn://svn.chromium.org/blink/trunk@159364 bbb929c8-8fbe-4397-9dbb-9b2b20218538
FINALize the NodeList hierarchy

Add final to all the leaf classes in the NodeList class hierarchy.
I also fixed the whitespace and indentation in these files.

Review URL: https://codereview.chromium.org/26248007

git-svn-id: svn://svn.chromium.org/blink/trunk@159365 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Use Skia color filters for SVG & CSS luminance masking.

This CL refactors luminance masking using SkLumaColorFilter, and removes
all dependencies on SkLumaXfermode (soon to be deprecated).

Because color filters are applied on the source layer, we now need to
composite the mask layer into the content layer using dstIn (unlike the
current implementation which composites the content layer into the mask
layer using srcIn):

  - beginLayer (content layer, srcOver mode)
    - draw content
    - beginLayer (mask layer, dstIn mode + luminance-to-alpha filter)
      - draw mask
    - endLayer: dstIn(luma(mask layer), content layer)
  - endLayer: srcOver(content layer, backdrop)

This sequence requires most of the masking logic to be relocated
to RenderSVGResourceMasker::postApplyResource().

The new luminance approach also enables some GC API consolidation:

  * beginTransparencyLayer/beginMaskedLayer -> beginLayer
  * setColorSpaceConversion/setDrawLuminanceMask/drawLuminanceMask
                                     -> setColorFilter/colorFilter

One pixel test (filter-clip.svg) needs rebaselining due to minor
edge blending differences.

R=schenney@chromium.org,pdr@chromium.org,senorblanco@chromium.org,andrei.prv@gmail.com

Review URL: https://codereview.chromium.org/26428003

git-svn-id: svn://svn.chromium.org/blink/trunk@159366 bbb929c8-8fbe-4397-9dbb-9b2b20218538