Change SkShader;asFragmentProcessor signature to no longer take skpaint\grcolor*

src/gpu/effects/GrExtractAlphaFragmentProcessor.cpp

Index: src/gpu/effects/GrExtractAlphaFragmentProcessor.cpp
diff --git a/src/gpu/effects/GrExtractAlphaFragmentProcessor.cpp b/src/gpu/effects/GrExtractAlphaFragmentProcessor.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..3414df2b135bb548d93223858bf18db197873af9
--- /dev/null
+++ b/src/gpu/effects/GrExtractAlphaFragmentProcessor.cpp
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "effects/GrExtractAlphaFragmentProcessor.h"
+#include "gl/GrGLFragmentProcessor.h"
+#include "gl/builders/GrGLProgramBuilder.h"
+
+class GLExtractAlphaFragmentProcessor : public GrGLFragmentProcessor {
+public:
+    GLExtractAlphaFragmentProcessor() {}
+
+    void emitCode(EmitArgs& args) override {
+        GrGLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBuilder();
+        fsBuilder->codeAppendf("vec4 alpha4 = %s.aaaa;", args.fInputColor);
+        SkString output;
+        this->emitChild(0, "alpha4", &output, args);
+        fsBuilder->codeAppendf("%s = %s;", args.fOutputColor, output.c_str());
+    }
+
+private:
+    typedef GrGLFragmentProcessor INHERITED;
+};
+
+GrGLFragmentProcessor* GrExtractAlphaFragmentProcessor::onCreateGLInstance() const {
+    return SkNEW(GLExtractAlphaFragmentProcessor);
+}
+
+void GrExtractAlphaFragmentProcessor::onGetGLProcessorKey(const GrGLSLCaps&,
+                                                          GrProcessorKeyBuilder*) const {
+}
+
+bool GrExtractAlphaFragmentProcessor::onIsEqual(const GrFragmentProcessor&) const { return true; }
+
+void GrExtractAlphaFragmentProcessor::onComputeInvariantOutput(GrInvariantOutput* inout) const {
+    if (inout->validFlags() & kA_GrColorComponentFlag) {
+        GrColor color = GrColorPackA4(GrColorUnpackA(inout->color()));
+        inout->setToOther(kRGBA_GrColorComponentFlags, color,
+                          GrInvariantOutput::kWill_ReadInput);
+    } else {
+        inout->setToUnknown(GrInvariantOutput::kWill_ReadInput);
+    }
+    this->childProcessor(0).computeInvariantOutput(inout);
+}