Ping watchdog thread during GpuChannel destruction

gpu/gles2_conform_support/egl/context.h

Index: gpu/gles2_conform_support/egl/context.h
diff --git a/gpu/gles2_conform_support/egl/context.h b/gpu/gles2_conform_support/egl/context.h
index 341b5c0658d822e9a04e5d929cfccfd2301cac2d..6d1015df7fd18435977de31afeef7bc0625709a7 100644
--- a/gpu/gles2_conform_support/egl/context.h
+++ b/gpu/gles2_conform_support/egl/context.h
@@ -15,6 +15,7 @@
 #include "gpu/command_buffer/service/command_executor.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 #include "gpu/command_buffer/service/gpu_preferences.h"
+#include "gpu/command_buffer/service/progress_reporter_stub.h"
 #include "gpu/config/gpu_driver_bug_workarounds.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gl/gl_context.h"
@@ -111,6 +112,7 @@ class Context : public base::RefCountedThreadSafe<Context>,
   std::unique_ptr<gpu::gles2::GLES2Decoder> decoder_;
   std::unique_ptr<gpu::CommandExecutor> command_executor_;
   std::unique_ptr<gpu::TransferBuffer> transfer_buffer_;
+  gpu::gles2::ProgressReporterStub progress_reporter_;
 
   scoped_refptr<gl::GLContext> gl_context_;