Revert "Revert 100494 - Fix bug in SimulateAttrib0."""

TEST=none
BUG=95625
TBR=apatrick@chromium.org

Review URL: http://codereview.chromium.org/7796016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@100507 0039d316-1c4b-4281-b951-d872f2087c98
GLenum GLES2DecoderImpl::GetBoundDrawFrameBufferInternalFormat() {
  if (bound_draw_framebuffer_ != 0) {
    return bound_draw_framebuffer_->GetColorAttachmentFormat();
  } else if (offscreen_target_frame_buffer_.get()) {
    return offscreen_target_color_format_;
  } else {
    return back_buffer_color_format_;
  }
}

GLenum GLES2DecoderImpl::GetBoundDrawFrameBufferInternalFormat() {
  if (bound_draw_framebuffer_ != 0) {
    return bound_draw_framebuffer_->GetColorAttachmentFormat();
  } else if (offscreen_target_frame_buffer_.get()) {
    return offscreen_target_color_format_;
  } else {
    return back_buffer_color_format_;
  }
}
