message: Use GetBindGroupLayout in SamplerTests
diff: @@ -54,14 +54,6 @@ protected:
  DawnTest::TestSetUp();
  mRenderPass = utils::CreateBasicRenderPass(device, kRTSize, kRTSize);
  - mBindGroupLayout = utils::MakeBindGroupLayout(
  - device, {
  - {0, wgpu::ShaderStage::Fragment, wgpu::BindingType::Sampler},
  - {1, wgpu::ShaderStage::Fragment, wgpu::BindingType::SampledTexture},
  - });
  -
  - auto pipelineLayout = utils::MakeBasicPipelineLayout(device, &mBindGroupLayout);
  -
  auto vsModule = utils::CreateShaderModule(device, utils::SingleShaderStage::Vertex, R"(
  #version 450
  void main() {
  @@ -86,12 +78,12 @@ protected:
  )");
  utils::ComboRenderPipelineDescriptor pipelineDescriptor(device);
  - pipelineDescriptor.layout = pipelineLayout;
  pipelineDescriptor.vertexStage.module = vsModule;
  pipelineDescriptor.cFragmentStage.module = fsModule;
  pipelineDescriptor.cColorStates[0].format = mRenderPass.colorFormat;
  mPipeline = device.CreateRenderPipeline(&pipelineDescriptor);
  + mBindGroupLayout = mPipeline.GetBindGroupLayout(0);
  wgpu::TextureDescriptor descriptor;
  descriptor.dimension = wgpu::TextureDimension::e2D;
  