bool GLES2DecoderImpl::GetHelper(
    GLenum pname, GLint* params, GLsizei* num_written) {
  DCHECK(num_written);
  if (gfx::GetGLImplementation() != gfx::kGLImplementationEGLGLES2) {
    switch (pname) {
    case GL_IMPLEMENTATION_COLOR_READ_FORMAT:
      *num_written = 1;
      if (params) {
        *params = GL_RGBA;  // We don't support other formats.
      }
      return true;
    case GL_IMPLEMENTATION_COLOR_READ_TYPE:
      *num_written = 1;
      if (params) {
        *params = GL_UNSIGNED_BYTE;  // We don't support other types.
      }
      return true;
    case GL_MAX_FRAGMENT_UNIFORM_VECTORS:
      *num_written = 1;
      if (params) {
        *params = group_->max_fragment_uniform_vectors();
      }
      return true;
    case GL_MAX_VARYING_VECTORS:
      *num_written = 1;
      if (params) {
        *params = group_->max_varying_vectors();
      }
      return true;
    case GL_MAX_VERTEX_UNIFORM_VECTORS:
      *num_written = 1;
      if (params) {
        *params = group_->max_vertex_uniform_vectors();
      }
      return true;
    }
  }
  switch (pname) {
    case GL_MAX_VIEWPORT_DIMS:
      if (offscreen_target_frame_buffer_.get()) {
        *num_written = 2;
        if (params) {
          params[0] = renderbuffer_manager()->max_renderbuffer_size();
          params[1] = renderbuffer_manager()->max_renderbuffer_size();
        }
        return true;
      }
      return false;
    case GL_MAX_SAMPLES:
      *num_written = 1;
      if (params) {
        params[0] = renderbuffer_manager()->max_samples();
      }
      return true;
    case GL_MAX_RENDERBUFFER_SIZE:
      *num_written = 1;
      if (params) {
        params[0] = renderbuffer_manager()->max_renderbuffer_size();
      }
      return true;
    case GL_MAX_TEXTURE_SIZE:
      *num_written = 1;
      if (params) {
        params[0] = texture_manager()->MaxSizeForTarget(GL_TEXTURE_2D);
      }
      return true;
    case GL_MAX_CUBE_MAP_TEXTURE_SIZE:
      *num_written = 1;
      if (params) {
        params[0] = texture_manager()->MaxSizeForTarget(GL_TEXTURE_CUBE_MAP);
      }
      return true;
    case GL_COLOR_WRITEMASK:
      *num_written = 4;
      if (params) {
        params[0] = mask_red_;
        params[1] = mask_green_;
        params[2] = mask_blue_;
        params[3] = mask_alpha_;
      }
      return true;
    case GL_DEPTH_WRITEMASK:
      *num_written = 1;
      if (params) {
        params[0] = mask_depth_;
      }
      return true;
    case GL_STENCIL_BACK_WRITEMASK:
      *num_written = 1;
      if (params) {
        params[0] = mask_stencil_back_;
      }
      return true;
    case GL_STENCIL_WRITEMASK:
      *num_written = 1;
      if (params) {
        params[0] = mask_stencil_front_;
      }
      return true;
    case GL_DEPTH_TEST:
      *num_written = 1;
      if (params) {
        params[0] = enable_depth_test_;
      }
      return true;
    case GL_STENCIL_TEST:
      *num_written = 1;
      if (params) {
        params[0] = enable_stencil_test_;
      }
      return true;
    case GL_ALPHA_BITS:
      *num_written = 1;
      if (params) {
        GLint v = 0;
        glGetIntegerv(GL_ALPHA_BITS, &v);
        params[0] = BoundFramebufferHasColorAttachmentWithAlpha() ? v : 0;
      }
      return true;
    case GL_DEPTH_BITS:
      *num_written = 1;
      if (params) {
        GLint v = 0;
        glGetIntegerv(GL_DEPTH_BITS, &v);
        params[0] = BoundFramebufferHasDepthAttachment() ? v : 0;
      }
      return true;
    case GL_STENCIL_BITS:
      *num_written = 1;
      if (params) {
        GLint v = 0;
        glGetIntegerv(GL_STENCIL_BITS, &v);
        params[0] = BoundFramebufferHasStencilAttachment() ? v : 0;
      }
      return true;
    case GL_COMPRESSED_TEXTURE_FORMATS:
      *num_written = validators_->compressed_texture_format.GetValues().size();
      if (params) {
        for (GLint ii = 0; ii < *num_written; ++ii) {
          params[ii] = validators_->compressed_texture_format.GetValues()[ii];
        }
      }
      return true;
    case GL_NUM_COMPRESSED_TEXTURE_FORMATS:
      *num_written = 1;
      if (params) {
        *params = validators_->compressed_texture_format.GetValues().size();
      }
      return true;
    case GL_NUM_SHADER_BINARY_FORMATS:
      *num_written = 1;
      if (params) {
        *params = validators_->shader_binary_format.GetValues().size();
      }
      return true;
    case GL_SHADER_BINARY_FORMATS:
      *num_written = validators_->shader_binary_format.GetValues().size();
      if (params) {
        for (GLint ii = 0; ii <  *num_written; ++ii) {
          params[ii] = validators_->shader_binary_format.GetValues()[ii];
        }
      }
      return true;
    case GL_SHADER_COMPILER:
      *num_written = 1;
      if (params) {
        *params = GL_TRUE;
      }
      return true;
    case GL_ARRAY_BUFFER_BINDING:
      *num_written = 1;
      if (params) {
        if (bound_array_buffer_) {
          GLuint client_id = 0;
          buffer_manager()->GetClientId(bound_array_buffer_->service_id(),
                                        &client_id);
          *params = client_id;
        } else {
          *params = 0;
        }
      }
      return true;
    case GL_ELEMENT_ARRAY_BUFFER_BINDING:
      *num_written = 1;
      if (params) {
        if (bound_element_array_buffer_) {
          GLuint client_id = 0;
          buffer_manager()->GetClientId(
              bound_element_array_buffer_->service_id(),
              &client_id);
          *params = client_id;
        } else {
          *params = 0;
        }
      }
      return true;
    case GL_FRAMEBUFFER_BINDING:
      *num_written = 1;
      if (params) {
        FramebufferManager::FramebufferInfo* framebuffer =
            GetFramebufferInfoForTarget(GL_DRAW_FRAMEBUFFER);
        if (framebuffer) {
          GLuint client_id = 0;
          framebuffer_manager()->GetClientId(
              framebuffer->service_id(), &client_id);
          *params = client_id;
        } else {
          *params = 0;
        }
      }
      return true;
    case GL_READ_FRAMEBUFFER_BINDING:
      *num_written = 1;
      if (params) {
        FramebufferManager::FramebufferInfo* framebuffer =
            GetFramebufferInfoForTarget(GL_READ_FRAMEBUFFER);
        if (framebuffer) {
          GLuint client_id = 0;
          framebuffer_manager()->GetClientId(
              framebuffer->service_id(), &client_id);
          *params = client_id;
        } else {
          *params = 0;
        }
      }
      return true;
    case GL_RENDERBUFFER_BINDING:
      *num_written = 1;
      if (params) {
        RenderbufferManager::RenderbufferInfo* renderbuffer =
            GetRenderbufferInfoForTarget(GL_RENDERBUFFER);
        if (renderbuffer) {
          GLuint client_id = 0;
          renderbuffer_manager()->GetClientId(
              renderbuffer->service_id(), &client_id);
          *params = client_id;
        } else {
          *params = 0;
        }
      }
      return true;
    case GL_CURRENT_PROGRAM:
      *num_written = 1;
      if (params) {
        if (current_program_) {
          GLuint client_id = 0;
          program_manager()->GetClientId(
              current_program_->service_id(), &client_id);
          *params = client_id;
        } else {
          *params = 0;
        }
      }
      return true;
    case GL_TEXTURE_BINDING_2D:
      *num_written = 1;
      if (params) {
        TextureUnit& unit = texture_units_[active_texture_unit_];
        if (unit.bound_texture_2d) {
          GLuint client_id = 0;
          texture_manager()->GetClientId(
              unit.bound_texture_2d->service_id(), &client_id);
          *params = client_id;
        } else {
          *params = 0;
        }
      }
      return true;
    case GL_TEXTURE_BINDING_CUBE_MAP:
      *num_written = 1;
      if (params) {
        TextureUnit& unit = texture_units_[active_texture_unit_];
        if (unit.bound_texture_cube_map) {
          GLuint client_id = 0;
          texture_manager()->GetClientId(
              unit.bound_texture_cube_map->service_id(), &client_id);
          *params = client_id;
        } else {
          *params = 0;
        }
      }
      return true;
    case GL_TEXTURE_BINDING_EXTERNAL_OES:
      *num_written = 1;
      if (params) {
        TextureUnit& unit = texture_units_[active_texture_unit_];
        if (unit.bound_texture_external_oes) {
          GLuint client_id = 0;
          texture_manager()->GetClientId(
              unit.bound_texture_external_oes->service_id(), &client_id);
          *params = client_id;
        } else {
          *params = 0;
        }
      }
      return true;
    case GL_TEXTURE_BINDING_RECTANGLE_ARB:
      *num_written = 1;
      if (params) {
        TextureUnit& unit = texture_units_[active_texture_unit_];
        if (unit.bound_texture_rectangle_arb) {
          GLuint client_id = 0;
          texture_manager()->GetClientId(
              unit.bound_texture_rectangle_arb->service_id(), &client_id);
          *params = client_id;
        } else {
          *params = 0;
        }
      }
      return true;
    default:
      *num_written = util_.GLGetNumValuesReturned(pname);
      return false;
  }
}

Unknown