Add GrProcOptInfo class to track various output information for color and coverage stages.

include/gpu/GrInvariantOutput.h

Index: include/gpu/GrInvariantOutput.h
diff --git a/include/gpu/GrInvariantOutput.h b/include/gpu/GrInvariantOutput.h
index 8f38d1f8ac167c80372428f26f8dff83a003b0bb..0805ac7933e9c75e66fc03ac86106db00e924ec0 100644
--- a/include/gpu/GrInvariantOutput.h
+++ b/include/gpu/GrInvariantOutput.h
@@ -92,22 +92,9 @@ public:
         }
     }
 
-    bool isOpaque() const {
-        return ((fValidFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(fColor));
-    }
-
-    bool isSolidWhite() const {
-        return (fValidFlags == kRGBA_GrColorComponentFlags && 0xFFFFFFFF == fColor);
-    }
-
     GrColor color() const { return fColor; }
     uint8_t validFlags() const { return fValidFlags; }
 
-    bool willUseInputColor() const { return fWillUseInputColor; }
-    void resetWillUseInputColor() { fWillUseInputColor = true; }
-
-    void resetNonMulStageFound() { fNonMulStageFound = false; }
-
     /**
      * If isSingleComponent is true, then the flag values for r, g, b, and a must all be the
      * same. If the flags are all set then all color components must be equal.
@@ -122,6 +109,16 @@ protected:
     bool fWillUseInputColor;
 
 private:
+    friend class GrProcOptInfo;
+
+    void reset(GrColor color, GrColorComponentFlags flags, bool isSingleComponent) {
+        fColor = color;
+        fValidFlags = flags;
+        fIsSingleComponent = isSingleComponent;
+        fNonMulStageFound = false;
+        fWillUseInputColor = true;
+    }
+
     void internalSetToTransparentBlack() {
         fValidFlags = kRGBA_GrColorComponentFlags;
         fColor = 0;
@@ -137,6 +134,19 @@ private:
         return ((fValidFlags & kA_GrColorComponentFlag) && 0 == GrColorUnpackA(fColor));
     }
 
+    bool isOpaque() const {
+        return ((fValidFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(fColor));
+    }
+
+    bool isSolidWhite() const {
+        return (fValidFlags == kRGBA_GrColorComponentFlags && 0xFFFFFFFF == fColor);
+    }
+
+    bool willUseInputColor() const { return fWillUseInputColor; }
+    void resetWillUseInputColor() { fWillUseInputColor = true; }
+
+    void resetNonMulStageFound() { fNonMulStageFound = false; }
+
     SkDEBUGCODE(bool colorComponentsAllEqual() const;)
     /**
      * If alpha is valid, check that any valid R,G,B values are <= A