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/DMReplayTask.cpp b/dm/DMReplayTask.cpp
index bc94f73..7e183f6 100644
--- a/dm/DMReplayTask.cpp
+++ b/dm/DMReplayTask.cpp
@@ -19,7 +19,9 @@
 
 void ReplayTask::draw() {
     SkPicture picture;
-    SkCanvas* canvas = picture.beginRecording(fGM->width(), fGM->height(), 0 /*flags*/);
+    SkCanvas* canvas = picture.beginRecording(SkScalarCeilToInt(fGM->width()),
+                                              SkScalarCeilToInt(fGM->height()),
+                                              0 /*flags*/);
 
     canvas->concat(fGM->getInitialTransform());
     fGM->draw(canvas);
@@ -28,7 +30,7 @@
     picture.endRecording();
 
     SkBitmap bitmap;
-    bitmap.setConfig(fConfig, fGM->width(), fGM->height());
+    bitmap.setConfig(fConfig, SkScalarCeilToInt(fGM->width()), SkScalarCeilToInt(fGM->height()));
     bitmap.allocPixels();
     bitmap.eraseColor(0x00000000);