Add the ability to send triggers to the Perfetto Service.

This enables Perfetto to receive Triggers from connected producers.
Extending the API to let producers start a pending Trace. Currently
only supports START_TRACING mode.

Bug: 128966650
Change-Id: I4cfd2c64f46e54ec76a3200ab304e817d456ee0f
diff --git a/src/tracing/core/tracing_service_impl.h b/src/tracing/core/tracing_service_impl.h
index 63beaa7..d8fb2af 100644
--- a/src/tracing/core/tracing_service_impl.h
+++ b/src/tracing/core/tracing_service_impl.h
@@ -92,6 +92,7 @@
     void NotifyDataSourceStopped(DataSourceInstanceID) override;
     SharedMemory* shared_memory() const override;
     size_t shared_buffer_page_size_kb() const override;
+    void ActivateTriggers(const std::vector<std::string>&) override;
 
     void OnTracingSetup();
     void SetupDataSource(DataSourceInstanceID, const DataSourceConfig&);