Fix DM build failures.

Fix DM build failures:
  - forgot tool_main;
  - skip building where skia_gpu is false;
  - lots of scalar -> int warnings;
  - stray return on a void method;
  - stifle warning about a uint32_t cast to bool

BUG=

Committed: http://code.google.com/p/skia/source/detail?r=11821

[mtklein, 2013-10-16 15:17:01]

No rush.

[mtklein, 2013-10-16 15:55:57]

Elliot seems to have his hands full today.  Ben?

[bungeman-skia, 2013-10-16 16:00:47]

https://codereview.chromium.org/26468005/diff/5001/dm/DMGpuTask.cpp
File dm/DMGpuTask.cpp (right):

https://codereview.chromium.org/26468005/diff/5001/dm/DMGpuTask.cpp#newcode43
dm/DMGpuTask.cpp:43: SkGpuDevice device(gr, fConfig, (int)fGM->width(),
(int)fGM->height(), fSampleCount);
SkScalerCeilToInt

https://codereview.chromium.org/26468005/diff/5001/dm/DMGpuTask.cpp#newcode60
dm/DMGpuTask.cpp:60: if (fGM->getFlags() & skiagm::GM::kSkipGPU_Flag) {
SkToBool

[mtklein, 2013-10-16 16:05:15]

On 2013/10/16 16:00:47, bungeman1 wrote:
> https://codereview.chromium.org/26468005/diff/5001/dm/DMGpuTask.cpp
> File dm/DMGpuTask.cpp (right):
> 
> https://codereview.chromium.org/26468005/diff/5001/dm/DMGpuTask.cpp#newcode43
> dm/DMGpuTask.cpp:43: SkGpuDevice device(gr, fConfig, (int)fGM->width(),
> (int)fGM->height(), fSampleCount);
> SkScalerCeilToInt
> 
> https://codereview.chromium.org/26468005/diff/5001/dm/DMGpuTask.cpp#newcode60
> dm/DMGpuTask.cpp:60: if (fGM->getFlags() & skiagm::GM::kSkipGPU_Flag) {
> SkToBool

PTAL

[bungeman-skia, 2013-10-16 16:06:04]

lgtm

[commit-bot: I haz the power, 2013-10-16 17:25:05]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/mtklein@google.com/26468005/12001

[commit-bot: I haz the power, 2013-10-16 17:38:39]

Retried try job too often on Build-Mac10.7-Clang-x86-Release-Trybot for step(s)
BuildEverything
http://skiabot-master.pogerlabs.com:10117/buildstatus?builder=Build-Mac10.7-C...

[commit-bot: I haz the power, 2013-10-16 17:38:42]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/mtklein@google.com/26468005/26001

[commit-bot: I haz the power, 2013-10-16 18:21:16]

Change committed as 11821

[epoger, 2013-10-17 16:18:58]

LGTM