Ping watchdog thread during GpuChannel destruction

gpu/ipc/service/gpu_command_buffer_stub.h

Index: gpu/ipc/service/gpu_command_buffer_stub.h
diff --git a/gpu/ipc/service/gpu_command_buffer_stub.h b/gpu/ipc/service/gpu_command_buffer_stub.h
index 48c7752b1d49845f4497c1325d62a69c5585449a..775a821905d91e188717a935cc2b2c29e2adec1e 100644
--- a/gpu/ipc/service/gpu_command_buffer_stub.h
+++ b/gpu/ipc/service/gpu_command_buffer_stub.h
@@ -23,6 +23,7 @@
 #include "gpu/command_buffer/service/command_buffer_service.h"
 #include "gpu/command_buffer/service/command_executor.h"
 #include "gpu/command_buffer/service/context_group.h"
+#include "gpu/command_buffer/service/progress_reporter.h"
 #include "gpu/gpu_export.h"
 #include "gpu/ipc/common/surface_handle.h"
 #include "gpu/ipc/service/gpu_memory_manager.h"
@@ -59,6 +60,7 @@ struct WaitForCommandState;
 class GPU_EXPORT GpuCommandBufferStub
     : public IPC::Listener,
       public IPC::Sender,
+      public gles2::ProgressReporter,
       public base::SupportsWeakPtr<GpuCommandBufferStub> {
  public:
   class DestructionObserver {
@@ -88,6 +90,9 @@ class GPU_EXPORT GpuCommandBufferStub
   // IPC::Sender implementation:
   bool Send(IPC::Message* msg) override;
 
+  // ProgressReporter implementation
+  void ReportProgress() override;
+
   gles2::MemoryTracker* GetMemoryTracker() const;
 
   // Whether this command buffer can currently handle IPC messages.