Ping watchdog thread during GpuChannel destruction

gpu/command_buffer/service/context_group.h

Index: gpu/command_buffer/service/context_group.h
diff --git a/gpu/command_buffer/service/context_group.h b/gpu/command_buffer/service/context_group.h
index 43f2d4124083101c4ad59590ed0826bcb283df18..52a918c25f77d5d7716a451a1d26e4d5918971b4 100644
--- a/gpu/command_buffer/service/context_group.h
+++ b/gpu/command_buffer/service/context_group.h
@@ -39,6 +39,7 @@ class MailboxManager;
 class RenderbufferManager;
 class PathManager;
 class ProgramManager;
+class ProgressReporter;
 class SamplerManager;
 class ShaderManager;
 class TextureManager;
@@ -59,7 +60,8 @@ class GPU_EXPORT ContextGroup : public base::RefCounted<ContextGroup> {
           framebuffer_completeness_cache,
       const scoped_refptr<FeatureInfo>& feature_info,
       bool bind_generates_resource,
-      gpu::ImageFactory* image_factory);
+      gpu::ImageFactory* image_factory,
+      ProgressReporter* progress_reporter);
 
   // This should only be called by GLES2Decoder. This must be paired with a
   // call to destroy if it succeeds.
@@ -294,6 +296,8 @@ class GPU_EXPORT ContextGroup : public base::RefCounted<ContextGroup> {
 
   std::unique_ptr<PassthroughResources> passthrough_resources_;
 
+  ProgressReporter* progress_reporter_;
+
   DISALLOW_COPY_AND_ASSIGN(ContextGroup);
 };