command_buffer: Defer restoring of FBO bindings when changing virtual contexts

gpu/command_buffer/service/gles2_cmd_decoder_unittest_drawing.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <stdint.h>
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 2113 matching lines @@
   DoFramebufferTexture2D(GL_FRAMEBUFFER,
                          GL_COLOR_ATTACHMENT0,
                          GL_TEXTURE_2D,
                          kFBOClientTextureId,
                          kFBOServiceTextureId,
                          0,
                          GL_NO_ERROR);
 
   DoBindRenderbuffer(
       GL_RENDERBUFFER, client_renderbuffer_id_, kServiceRenderbufferId);
-  DoBindFramebuffer(
-      GL_FRAMEBUFFER, client_framebuffer_id_, kServiceFramebufferId);
   DoRenderbufferStorage(GL_RENDERBUFFER,
                         GL_DEPTH_COMPONENT16,
                         GL_DEPTH_COMPONENT,
                         1,
                         1,
                         GL_NO_ERROR);
   DoFramebufferRenderbuffer(GL_FRAMEBUFFER,
                             GL_DEPTH_ATTACHMENT,
                             GL_RENDERBUFFER,
                             client_renderbuffer_id_,
@@ skipping 176 matching lines @@
       .Times(1)
       .RetiresOnSaturation();
   DrawArrays cmd;
   cmd.Init(GL_TRIANGLES, 0, kNumVertices);
   EXPECT_EQ(error::kNoError, ExecuteCmd(cmd));
   EXPECT_EQ(GL_NO_ERROR, GetGLError());
 }
 
 }  // namespace gles2
 }  // namespace gpu