fix casts

(starting with mtklein's 966503002 mod to 963593003)
fix casts

Committed: https://skia.googlesource.com/skia/+/9e73a84deb5e6c201081b1d30175863898543e8d

Committed: https://skia.googlesource.com/skia/+/94b4ee85f2692ac6e4e32cc9b4f3da23d6e21c31

[caryclark, 2015-03-04 18:42:32]

caryclark@google.com changed reviewers:
+ mtklein@google.com

[mtklein, 2015-03-04 19:07:25]

lgtm

[caryclark, 2015-03-04 19:15:53]

The CQ bit was checked by caryclark@google.com

[commit-bot: I haz the power, 2015-03-04 19:16:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/979453004/1

[commit-bot: I haz the power, 2015-03-04 19:22:08]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/9e73a84deb5e6c201081b1d30175863898543e8d

[mtklein, 2015-03-04 19:45:18]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/977583007/ by mtklein@google.com.

The reason for reverting is: 64-bit windows build warnings-as-errors.

[caryclark, 2015-03-04 20:16:23]

The CQ bit was checked by caryclark@google.com

[caryclark, 2015-03-04 20:16:24]

The patchset sent to the CQ was uploaded after l-g-t-m from mtklein@google.com
Link to the patchset: https://codereview.chromium.org/979453004/#ps20001 (title:
"fix cast for 64 bit windows")

[commit-bot: I haz the power, 2015-03-04 20:26:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/979453004/20001

[commit-bot: I haz the power, 2015-03-04 20:32:26]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/94b4ee85f2692ac6e4e32cc9b4f3da23d6e21c31