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=
R=bungeman@google.com

Author: mtklein@google.com

Review URL: https://codereview.chromium.org/26468005

git-svn-id: http://skia.googlecode.com/svn/trunk@11821 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/dm/DMCpuTask.cpp b/dm/DMCpuTask.cpp
index 5534ba4..544f73c 100644
--- a/dm/DMCpuTask.cpp
+++ b/dm/DMCpuTask.cpp
@@ -24,7 +24,7 @@
 
 void CpuTask::draw() {
     SkBitmap bitmap;
-    bitmap.setConfig(fConfig, fGM->width(), fGM->height());
+    bitmap.setConfig(fConfig, SkScalarCeilToInt(fGM->width()), SkScalarCeilToInt(fGM->height()));
     bitmap.allocPixels();
     bitmap.eraseColor(0x00000000);
     SkCanvas canvas(bitmap);