create GrTestUtils.h, move some common functions into it

include/gpu/GrProcessorUnitTest.h

Index: include/gpu/GrProcessorUnitTest.h
diff --git a/include/gpu/GrProcessorUnitTest.h b/include/gpu/GrProcessorUnitTest.h
index 4b97483c0fa438f017c2c6728ed04c2b5084bd44..5145a49749d029e2bf513686809ae73b3ecb8bdb 100644
--- a/include/gpu/GrProcessorUnitTest.h
+++ b/include/gpu/GrProcessorUnitTest.h
@@ -8,8 +8,7 @@
 #ifndef GrProcessorUnitTest_DEFINED
 #define GrProcessorUnitTest_DEFINED
 
-#include "GrColor.h"
-#include "SkRandom.h"
+#include "GrTestUtils.h"
 #include "SkTArray.h"
 #include "SkTypes.h"
 
@@ -23,71 +22,6 @@ enum {
     kAlphaTextureIdx = 1,
 };
 
-/**
- * A helper for use in GrProcessor::TestCreate functions.
- */
-const SkMatrix& TestMatrix(SkRandom*);
-
-}
-
-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 CoverageMode {
-        kZero_CoverageMode,
-        kAllOnes_CoverageMode,
-        kRandom_CoverageMode,
-        kLast_CoverageMode = kRandom_CoverageMode
-    };
-
-    CoverageMode colorMode = CoverageMode(random->nextULessThan(kLast_CoverageMode + 1));
-    uint8_t coverage;
-    switch (colorMode) {
-        case kZero_CoverageMode:
-            coverage = 0;
-        case kAllOnes_CoverageMode:
-            coverage = 0xff;
-            break;
-        case kRandom_CoverageMode:
-            coverage = random->nextULessThan(256);
-            break;
-    }
-    return coverage;
 }
 
 #if SK_ALLOW_STATIC_GLOBAL_INITIALIZERS