Adds ability to draw rects using a unit square vertex buffer. Useful when matrix/uniform changes are less expensive than sending new verts. 

Adds optional matrix parameters to GrContext drawRect and drawRectToRect so that non-axis-aligned matrices can be drawn using these functions.

codereview Issue 4105049

git-svn-id: http://skia.googlecode.com/svn/trunk@749 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/include/GrConfig.h b/gpu/include/GrConfig.h
index 7169e2e..b599a53 100644
--- a/gpu/include/GrConfig.h
+++ b/gpu/include/GrConfig.h
@@ -234,6 +234,12 @@
 #define GrAlwaysAssert(COND) GR_ALWAYSASSERT(COND)
 
 /**
+ * Crash from unrecoverable condition, optionally with a message.
+ */
+inline void GrCrash() { GrAlwaysAssert(false); }
+inline void GrCrash(const char* msg) { GrPrintf(msg); GrAlwaysAssert(false); }
+
+/**
  *  GR_DEBUGCODE compiles the code X in debug builds only 
  */
 #if !defined(GR_DEBUGCODE)