Fix bounds computation of all 0-input filters.

Fix bounds computation of all 0-input filters.

The SkRectShaderImageFilter had the same bug as previously fixed for
SkBitmapSource and SkPictureImageFilter. Rather than copy-and-paste
the implementation, this change makes all filters with 0 inputs return
their source bounds, instead of returning false.

BUG=427251
Committed: https://skia.googlesource.com/skia/+/8f3937d9fcb28018ec14db6697d41b645716d589

[Stephen White, 2014-10-27 03:13:16]

senorblanco@chromium.org changed reviewers:
+ reed@google.com

[Stephen White, 2014-10-27 03:13:16]

PTAL. Thanks!

[Stephen White, 2014-10-27 19:34:50]

senorblanco@chromium.org changed reviewers:
+ bsalomon@google.com
- reed@google.com

[Stephen White, 2014-10-27 19:35:00]

bsalomon@: PTAL. Thanks!

[bsalomon, 2014-10-27 20:28:56]

lgtm

[Stephen White, 2014-10-27 20:29:36]

The CQ bit was checked by senorblanco@chromium.org

[commit-bot: I haz the power, 2014-10-27 20:29:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/681643003/20001

[commit-bot: I haz the power, 2014-10-27 20:38:17]

Committed patchset #2 (id:20001) as ba036cc82b5a543a13cafd11a19ba0e3087fca38

[hcm, 2014-10-28 03:16:15]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/681153002/ by hcm@google.com.

The reason for reverting is: Failures on image filter tests in Skia and Blink.

[hcm, 2014-10-28 03:54:40]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/678273002/ by hcm@google.com.

The reason for reverting is: try again.

[Stephen White, 2014-10-29 16:15:33]

The CQ bit was checked by senorblanco@chromium.org

[commit-bot: I haz the power, 2014-10-29 16:15:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/681643003/40001

[commit-bot: I haz the power, 2014-10-29 19:36:38]

Committed patchset #3 (id:40001) as 8f3937d9fcb28018ec14db6697d41b645716d589