Move Skia's variables and defines to skia_common.

Move Skia's variables and defines to skia_common.

skia_library_opts was not being compiled with any of these defines.  Now it is.

Testing:
  1) build/gyp_chromium && ninja -C out/Debug
  2) Looked for Skia defines in .ninja files

master:
$ grep -l DSK *.ninja
filter_fuzz_stub.ninja
image_operations_bench.ninja
skia_chrome.ninja
skia_library.ninja

this CL:
$ grep -l DSK *.ninja
filter_fuzz_stub.ninja
image_operations_bench.ninja
skia_chrome.ninja
skia_library.ninja
skia_opts.ninja
skia_opts_none.ninja
skia_opts_ssse3.ninja

BUG=
R=bungeman@google.com

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=241394

[mtklein, 2013-12-13 19:10:26]

This is a tricky CL to review, I admit.  I found putting up both diffs
side-by-side helps.

[bungeman-skia, 2013-12-13 20:21:31]

lgtm

[mtklein, 2013-12-17 18:09:25]

Ben, I'm out until the 30th.  If you're around and this is blocking
anything, can you land this?  If not, I'll do it when I get back.


On Fri, Dec 13, 2013 at 3:21 PM, <bungeman@google.com> wrote:

> lgtm
>
> https://codereview.chromium.org/98503006/
>

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[bungeman-chromium, 2013-12-17 22:42:49]

Committed patchset #2 manually as r241394 (presubmit successful).