Add onGetBlendInfo to GrXferProcessor

src/gpu/gl/GrGLNoOpInterface.cpp

Index: src/gpu/gl/GrGLNoOpInterface.cpp
diff --git a/src/gpu/gl/GrGLNoOpInterface.cpp b/src/gpu/gl/GrGLNoOpInterface.cpp
index 6b8880ed81c9c19ad1bf646438b4a88fa41e2ba1..be1355ce86a8d60fbc5907cbb70ed7d9ec73ca08 100644
--- a/src/gpu/gl/GrGLNoOpInterface.cpp
+++ b/src/gpu/gl/GrGLNoOpInterface.cpp
@@ -28,6 +28,7 @@ static const char* kExtensions[] = {
     "GL_ARB_draw_buffers",
     "GL_ARB_occlusion_query",
     "GL_EXT_blend_color",
+    "GL_EXT_blend_subtract",
     "GL_EXT_stencil_wrap"
 };
 
@@ -48,15 +49,18 @@ const GrGLubyte* combined_extensions_string() {
 }
 }
 
+GrGLvoid GR_GL_FUNCTION_TYPE noOpGLBindFragDataLocation(GrGLuint program,
+                                                        GrGLuint colorNumber,
+                                                        const GrGLchar* name) {
+}
+
 GrGLvoid GR_GL_FUNCTION_TYPE noOpGLBlendColor(GrGLclampf red,
                                               GrGLclampf green,
                                               GrGLclampf blue,
                                               GrGLclampf alpha) {
 }
 
-GrGLvoid GR_GL_FUNCTION_TYPE noOpGLBindFragDataLocation(GrGLuint program,
-                                                        GrGLuint colorNumber,
-                                                        const GrGLchar* name) {
+GrGLvoid GR_GL_FUNCTION_TYPE noOpGLBlendEquation(GrGLenum mode) {
 }
 
 GrGLvoid GR_GL_FUNCTION_TYPE noOpGLBlendFunc(GrGLenum sfactor,