Initial CL to move color / coverage off of drawstate

include/gpu/GrProcessorUnitTest.h

Index: include/gpu/GrProcessorUnitTest.h
diff --git a/include/gpu/GrProcessorUnitTest.h b/include/gpu/GrProcessorUnitTest.h
index 3e1601dc8e049e20c9c4110f9d917b5db4559e87..4fe9785874aa03d55d334ace93f8284b94e07065 100644
--- a/include/gpu/GrProcessorUnitTest.h
+++ b/include/gpu/GrProcessorUnitTest.h
@@ -8,6 +8,7 @@
 #ifndef GrProcessorUnitTest_DEFINED
 #define GrProcessorUnitTest_DEFINED
 
+#include "GrColor.h"
 #include "SkRandom.h"
 #include "SkTArray.h"
 #include "SkTypes.h"
@@ -35,6 +36,63 @@ class GrContext;
 class GrProcessor;
 class GrTexture;
 
+static inline GrColor GrRandomColor(SkRandom* random) {
+    // There are only a few cases of random colors which interest us
+    enum ColorMode {
+        kAllOnes_ColorMode,
+        kAllZeros_ColorMode,
+        kAlphaOne_ColorMode,
+        kRandom_ColorMode,
+        kLast_ColorMode = kRandom_ColorMode
+    };
+
+    ColorMode colorMode = ColorMode(random->nextULessThan(kLast_ColorMode + 1));
+    GrColor color;
+    switch (colorMode) {
+        case kAllOnes_ColorMode:
+            color = GrColorPackRGBA(0xFF, 0xFF, 0xFF, 0xFF);
+            break;
+        case kAllZeros_ColorMode:
+            color = GrColorPackRGBA(0, 0, 0, 0);
+            break;
+        case kAlphaOne_ColorMode:
+            color = GrColorPackRGBA(random->nextULessThan(256),
+                                    random->nextULessThan(256),
+                                    random->nextULessThan(256),
+                                    0xFF);
+            break;
+        case kRandom_ColorMode:
+            uint8_t alpha = random->nextULessThan(256);
+            color = GrColorPackRGBA(random->nextRangeU(0, alpha),
+                                    random->nextRangeU(0, alpha),
+                                    random->nextRangeU(0, alpha),
+                                    alpha);
+            break;
+    }
+    GrColorIsPMAssert(color);
+    return color;
+}
+
+static inline uint8_t GrRandomCoverage(SkRandom* random) {
+    enum ColorModes {
+        kAllOnes_ColorMode,
+        kRandom_ColorMode,
+        kLast_ColorMode = kRandom_ColorMode
+    };
+
+    ColorModes colorMode = ColorModes(random->nextULessThan(kLast_ColorMode + 1));
+    uint8_t coverage;
+    switch (colorMode) {
+        case kAllOnes_ColorMode:
+            coverage = 0xff;
+            break;
+        case kRandom_ColorMode:
+            coverage = random->nextULessThan(256);
+            break;
+    }
+    return coverage;
+}
+
 template <class Processor>
 class GrProcessorTestFactory : SkNoncopyable {
 public: