Allow running gyp_to_android without SkUserConfig.

Allow running gyp_to_android without SkUserConfig.

The old code requires that include/config/SkUserConfig.h exists,
to ensure that it gets copied into Android's
include/core/SkUserConfig.h when we do a merge. However, if a
developer wants to make changes and rerun the script, they
should not have to recreate include/config/SkUserConfig.h just
to rerun the script. By default, allow the original to not
exist and just skip the copy.

Update tests to pass. Also add tests to support this use case.

Make gyp_to_android.py executable.

Committed: http://code.google.com/p/skia/source/detail?r=14273

[hal.canary, 2014-04-18 20:10:04]

lgtm

https://codereview.chromium.org/242203008/diff/1/platform_tools/android/gyp_g...
File platform_tools/android/gyp_gen/generate_user_config.py (right):

https://codereview.chromium.org/242203008/diff/1/platform_tools/android/gyp_g...
platform_tools/android/gyp_gen/generate_user_config.py:72: with
open(original_sk_user_config, 'r') as original:
Possibly faster (as it doesn't care about lines ending characters).

    with open(original_sk_user_config, 'r') as original:
      shutil.copyfileobj(original, dst)

[scroggo, 2014-04-18 22:24:16]

Patch set two updates the tests, and makes gyp_to_android.py executable.

https://codereview.chromium.org/242203008/diff/1/platform_tools/android/gyp_g...
File platform_tools/android/gyp_gen/generate_user_config.py (right):

https://codereview.chromium.org/242203008/diff/1/platform_tools/android/gyp_g...
platform_tools/android/gyp_gen/generate_user_config.py:72: with
open(original_sk_user_config, 'r') as original:
On 2014/04/18 20:10:04, Hal Canary wrote:
> Possibly faster (as it doesn't care about lines ending characters).
> 
>     with open(original_sk_user_config, 'r') as original:
>       shutil.copyfileobj(original, dst)

Done.

[scroggo, 2014-04-21 13:49:07]

The CQ bit was checked by scroggo@google.com

[commit-bot: I haz the power, 2014-04-21 13:49:11]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/scroggo@google.com/242203008/20001

[commit-bot: I haz the power, 2014-04-21 14:45:05]

Change committed as 14273