Generate platform specific fontmgr gm.

Generate platform specific fontmgr gm.

The gm output on different font platforms is so different
that comparing images in Gold has little value. Separate the
images by appending platform information to the gm name to
group somewhat similar images together.

Note that this does not attempt to make sure that all images
generated by Gold are nearly pixel identical; it only reduces
the number of nonsensical comparisons.

R=bungeman@google.com

Committed: https://skia.googlesource.com/skia/+/6531c3619f08cc83aad34883c5f00f6a358c9fad

[caryclark, 2015-07-20 14:48:08]

The CQ bit was checked by caryclark@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-07-20 14:48:19]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1245643002/1

[commit-bot: I haz the power, 2015-07-20 14:55:39]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-20 14:55:40]

Dry run: This issue passed the CQ dry run.

[caryclark, 2015-07-20 20:09:07]

The CQ bit was checked by caryclark@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-07-20 20:09:18]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1245643002/20001

[commit-bot: I haz the power, 2015-07-20 20:10:31]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-20 20:10:31]

Dry run: Try jobs failed on following builders:
  Build-Mac10.8-Clang-x86_64-Release-Trybot on client.skia.compile (JOB_FAILED,
http://build.chromium.org/p/client.skia.compile/builders/Build-Mac10.8-Clang-...)

[bungeman-skia, 2015-07-20 20:15:11]

https://codereview.chromium.org/1245643002/diff/20001/tools/sk_tool_utils.cpp
File tools/sk_tool_utils.cpp (right):

https://codereview.chromium.org/1245643002/diff/20001/tools/sk_tool_utils.cpp...
tools/sk_tool_utils.cpp:18: extern bool internal_tool_utils_win_gdi();
Not using this anymore?

[caryclark, 2015-07-20 20:28:12]

https://codereview.chromium.org/1245643002/diff/20001/tools/sk_tool_utils.cpp
File tools/sk_tool_utils.cpp (right):

https://codereview.chromium.org/1245643002/diff/20001/tools/sk_tool_utils.cpp...
tools/sk_tool_utils.cpp:18: extern bool internal_tool_utils_win_gdi();
On 2015/07/20 20:15:11, bungeman1 wrote:
> Not using this anymore?

Good catch. (Removed)

[caryclark, 2015-07-20 20:28:21]

The CQ bit was checked by caryclark@google.com to run a CQ dry run

[commit-bot: I haz the power, 2015-07-20 20:28:30]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1245643002/40001

[commit-bot: I haz the power, 2015-07-20 20:36:04]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-07-20 20:36:05]

Dry run: This issue passed the CQ dry run.

[bungeman-skia, 2015-07-20 20:37:29]

lgtm

[caryclark, 2015-07-20 20:38:14]

The CQ bit was checked by caryclark@google.com

[commit-bot: I haz the power, 2015-07-20 20:38:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1245643002/40001

[commit-bot: I haz the power, 2015-07-20 20:38:58]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/6531c3619f08cc83aad34883c5f00f6a358c9fad