Ping watchdog thread during GpuChannel destruction

gpu/command_buffer/service/shader_manager_unittest.cc

 // Copyright (c) 2012 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/shader_manager.h"
 
 #include "gpu/command_buffer/service/gpu_service_test.h"
 #include "gpu/command_buffer/service/mocks.h"
 #include "gpu/command_buffer/service/test_helper.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gl/gl_mock.h"
 
 using ::testing::Return;
 using ::testing::ReturnRef;
 
 namespace gpu {
 namespace gles2 {
 
 class ShaderManagerTest : public GpuServiceTest {
  public:
-  ShaderManagerTest() {
-  }
+  ShaderManagerTest() : manager_(nullptr) {}
 
   ~ShaderManagerTest() override { manager_.Destroy(false); }
 
  protected:
   ShaderManager manager_;
 };
 
 TEST_F(ShaderManagerTest, Basic) {
   const GLuint kClient1Id = 1;
   const GLuint kService1Id = 11;
@@ skipping 280 matching lines @@
   EXPECT_CALL(*gl_, DeleteShader(kService1Id))
       .Times(1)
       .RetiresOnSaturation();
   manager_.Delete(shader1);  // this should delete the shader.
   shader2 = manager_.GetShader(kClient1Id);
   EXPECT_TRUE(shader2 == NULL);
 }
 
 }  // namespace gles2
 }  // namespace gpu