Improve tracking of bound FBOs in GrGLGpu.

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 422 matching lines @@
 }
 
 GrGLvoid GR_GL_FUNCTION_TYPE noOpGLBindFragDataLocationIndexed(GrGLuint program,
                                                                GrGLuint colorNumber,
                                                                GrGLuint index,
                                                                const GrGLchar * name) {
 }
 
 GrGLenum GR_GL_FUNCTION_TYPE noOpGLCheckFramebufferStatus(GrGLenum target) {
 
-    GrAlwaysAssert(GR_GL_FRAMEBUFFER == target);
+    GrAlwaysAssert(GR_GL_FRAMEBUFFER == target || GR_GL_READ_FRAMEBUFFER == target ||
+                   GR_GL_DRAW_FRAMEBUFFER == target);
 
     return GR_GL_FRAMEBUFFER_COMPLETE;
 }
 
 GrGLvoid GR_GL_FUNCTION_TYPE noOpGLGenIds(GrGLsizei n, GrGLuint* ids) {
     static int gCurrID = 1;
     for (int i = 0; i < n; ++i) {
         ids[i] = ++gCurrID;
    }
 }
@@ skipping 201 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() {
 }