Add onGetBlendInfo to GrXferProcessor

src/gpu/gl/GrGLNoOpInterface.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLNoOpInterface.h"
 #include "SkString.h"
 #include "SkThread.h"
@@ skipping 10 matching lines @@
 // the OpenGLES 2.0 spec says this must be >= 8
 static const GrGLint kDefaultMaxVaryingVectors = 8;
 
 static const char* kExtensions[] = {
     "GL_ARB_framebuffer_object",
     "GL_ARB_blend_func_extended",
     "GL_ARB_timer_query",
     "GL_ARB_draw_buffers",
     "GL_ARB_occlusion_query",
     "GL_EXT_blend_color",
+    "GL_EXT_blend_subtract",
     "GL_EXT_stencil_wrap"
 };
 
 namespace {
 const GrGLubyte* combined_extensions_string() {
     static SkString gExtString;
     static SkMutex gMutex;
     gMutex.acquire();
     if (0 == gExtString.size()) {
         for (size_t i = 0; i < SK_ARRAY_COUNT(kExtensions) - 1; ++i) {
             gExtString.append(kExtensions[i]);
             gExtString.append(" ");
         }
         gExtString.append(kExtensions[SK_ARRAY_COUNT(kExtensions) - 1]);
     }
     gMutex.release();
     return (const GrGLubyte*) gExtString.c_str();
 }
 }
 
+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,
                                               GrGLenum dfactor) {
 }
 
 GrGLvoid GR_GL_FUNCTION_TYPE noOpGLBufferSubData(GrGLenum target,
                                                  GrGLintptr offset,
                                                  GrGLsizeiptr size,
                                                  const GrGLvoid* data) {
@@ skipping 585 matching lines @@
     static int gUniLocation = 0;
     return ++gUniLocation;
 }
 
 GrGLvoid GR_GL_FUNCTION_TYPE noOpGLInsertEventMarker(GrGLsizei length, const char* marker) {
 }
 GrGLvoid GR_GL_FUNCTION_TYPE noOpGLPushGroupMarker(GrGLsizei length  , const char* marker) {
 }
 GrGLvoid GR_GL_FUNCTION_TYPE noOpGLPopGroupMarker() {
 }