Create fragment processor for performing input color blend with child processor

src/gpu/gl/GrGLSLBlend.h

Index: src/gpu/gl/GrGLSLBlend.h
diff --git a/src/gpu/gl/GrGLBlend.h b/src/gpu/gl/GrGLSLBlend.h
similarity index 66%
rename from src/gpu/gl/GrGLBlend.h
rename to src/gpu/gl/GrGLSLBlend.h
index af447b47bf29704276e07b88779d70cecf944b5f..b763f450d87c6c5f7939bc7f63da190c52720263 100644
--- a/src/gpu/gl/GrGLBlend.h
+++ b/src/gpu/gl/GrGLSLBlend.h
@@ -12,13 +12,13 @@
 
 class GrGLFragmentBuilder;
 
-namespace GrGLBlend {
+namespace GrGLSLBlend {
     /*
      * Appends GLSL code to fsBuilder that assigns a specified blend of the srcColor and dstColor
      * variables to the outColor variable.
      */
-    void AppendPorterDuffBlend(GrGLFragmentBuilder* fsBuilder, const char* srcColor,
-                               const char* dstColor, const char* outColor, SkXfermode::Mode mode);
+    void AppendMode(GrGLFragmentBuilder* fsBuilder, const char* srcColor,
+                    const char* dstColor, const char* outColor, SkXfermode::Mode mode);
 };
 
 #endif