Move GrInvariantOutput out of GrProcessor and into its own class.

tests/GpuColorFilterTest.cpp

Index: tests/GpuColorFilterTest.cpp
diff --git a/tests/GpuColorFilterTest.cpp b/tests/GpuColorFilterTest.cpp
index 82f5f31b3ea8bf803a210c86d3c5a5fbe590ede4..aeee3daf37860971fe4070d2e9f550024b8c3128 100644
--- a/tests/GpuColorFilterTest.cpp
+++ b/tests/GpuColorFilterTest.cpp
@@ -11,6 +11,7 @@
 #include "GrContext.h"
 #include "GrContextFactory.h"
 #include "GrFragmentProcessor.h"
+#include "GrInvariantOutput.h"
 #include "SkColorFilter.h"
 #include "SkGr.h"
 #include "Test.h"
@@ -99,9 +100,9 @@ static void test_getConstantColorComponents(skiatest::Reporter* reporter, GrCont
         const GetConstantComponentTestCase& test = filterTests[i];
         SkAutoTUnref<SkColorFilter> cf(SkColorFilter::CreateModeFilter(test.filterColor, test.filterMode));
         SkAutoTUnref<GrFragmentProcessor> effect(cf->asFragmentProcessor(grContext));
-        GrProcessor::InvariantOutput inout;
-        inout.setToOther(test.inputComponents, test.inputColor,
-                         GrProcessor::InvariantOutput::kWill_ReadInput);
+        GrInvariantOutput inout(test.inputColor,
+                                static_cast<GrColorComponentFlags>(test.inputComponents),
+                                false);
         effect->computeInvariantOutput(&inout);
 
         REPORTER_ASSERT(reporter, filterColor(inout.color(), inout.validFlags()) == test.outputColor);