Add SkDEBUGFAIL to clean up use of SkASSERT(!"text");
catch a couple of latent SkASSERT("text") bugs.

http://codereview.appspot.com/5504090/



git-svn-id: http://skia.googlecode.com/svn/trunk@2926 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/SkGr.cpp b/src/gpu/SkGr.cpp
index 0205dd6..cab9d46 100644
--- a/src/gpu/SkGr.cpp
+++ b/src/gpu/SkGr.cpp
@@ -26,7 +26,7 @@
 
     SkAutoLockPixels apl(bitmap);
     if (!bitmap.readyToDraw()) {
-        SkASSERT(!"bitmap not ready to draw!");
+        SkDEBUGFAIL("bitmap not ready to draw!");
         return;
     }