Remove gpu shader optimatization for solid white or trans black colors

tests/GLProgramsTest.cpp

Index: tests/GLProgramsTest.cpp
diff --git a/tests/GLProgramsTest.cpp b/tests/GLProgramsTest.cpp
index 899b42fb4f12401c41d40c00d37fe6f52fa93727..9da1ecc53c0a798fdb9762c1b7376bdc7c088e2d 100644
--- a/tests/GLProgramsTest.cpp
+++ b/tests/GLProgramsTest.cpp
@@ -73,8 +73,9 @@ bool GrGLProgramDesc::setRandom(SkRandom* random,
     // if the effects have used up all off the available attributes,
     // don't try to use color or coverage attributes as input
     do {
-        header->fColorInput = static_cast<GrGLProgramDesc::ColorInput>(
-                                  random->nextULessThan(kColorInputCnt));
+        uint32_t colorRand = random->nextULessThan(2);
+        header->fColorInput = (0 == colorRand) ? GrGLProgramDesc::kAttribute_ColorInput :
+                                                 GrGLProgramDesc::kUniform_ColorInput;
     } while (GrDrawState::kMaxVertexAttribCnt <= currAttribIndex &&
              kAttribute_ColorInput == header->fColorInput);