Remove GP from drawstate, revision of invariant output for GP

include/gpu/GrFragmentProcessor.h

Index: include/gpu/GrFragmentProcessor.h
diff --git a/include/gpu/GrFragmentProcessor.h b/include/gpu/GrFragmentProcessor.h
index 3f308d7e75048df485d03aac3e9c148db80fd77f..0c155996d5aec2280e9468d29071d42ddbb76af4 100644
--- a/include/gpu/GrFragmentProcessor.h
+++ b/include/gpu/GrFragmentProcessor.h
@@ -67,6 +67,16 @@ public:
         return this->onIsEqual(that);
     }
 
+    /**
+     * This function is used to perform optimizations. When called the invarientOuput param
+     * indicate whether the input components to this processor in the FS will have known values.
+     * In inout the validFlags member is a bitfield of GrColorComponentFlags. The isSingleComponent
+     * member indicates whether the input will be 1 or 4 bytes. The function updates the members of
+     * inout to indicate known values of its output. A component of the color member only has
+     * meaning if the corresponding bit in validFlags is set.
+     */
+    void computeInvariantOutput(GrInvariantOutput* inout) const;
+
 protected:
     /**
      * Fragment Processor subclasses call this from their constructor to register coordinate
@@ -101,6 +111,11 @@ protected:
      */
     void setWillNotUseInputColor() { fWillUseInputColor = false; }
 
+    /**
+     * Subclass implements this to support getConstantColorComponents(...).
+     */
+    virtual void onComputeInvariantOutput(GrInvariantOutput* inout) const = 0;
+
 private:
     /**
      * Subclass implements this to support isEqual(). It will only be called if it is known that