Fix crash reporter missing in Linux builds.

#rb Ben.Marsh (discussed)
#fyi Ben.Marsh, Matt.Kuhlenschmidt
#lockdown Nick.Penwarden

[CL 3622648 by Arciel Rekman in Main branch]

Engine/Source/Programs/CrashReportClient/Private/SCrashReportClient.h

@@ -0,0 +1,60 @@
+// Copyright 1998-2017 Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+#include "CrashReportClient.h"
+
+#if !CRASH_REPORT_UNATTENDED_ONLY
+
+#include "Widgets/SCompoundWidget.h"
+#include "Widgets/DeclarativeSyntaxSupport.h"
+#include "Widgets/Input/SMultiLineEditableTextBox.h"
+
+/**
+ * UI for the crash report client app
+ */
+class SCrashReportClient : public SCompoundWidget
+{
+public:
+	/**
+	 * Slate arguments
+	 */
+	SLATE_BEGIN_ARGS(SCrashReportClient)
+	{
+	}
+
+	SLATE_END_ARGS()
+
+	/**
+	 * Construct this Slate ui
+	 * @param InArgs Slate arguments, not used
+	 * @param Client Crash report client implementation object
+	 */
+	void Construct(const FArguments& InArgs, TSharedRef<FCrashReportClient> Client);
+
+private:
+	/**
+	 * Keyboard short-cut handler
+	 * @param InKeyEvent Which key was released, and which auxiliary keys were pressed
+	 * @return Whether the event was handled
+	 */
+	FReply OnUnhandledKeyDown(const FKeyEvent& InKeyEvent);
+
+	/** Called if the multi line widget text changes */
+	void OnUserCommentTextChanged(const FText& NewText);
+
+	/** Whether the hint text should be visible. */
+	EVisibility IsHintTextVisible() const;
+
+	/** Whether the send buttons are enabled. */
+	bool IsSendEnabled() const;
+
+	/** Crash report client implementation object */
+	TSharedPtr<FCrashReportClient> CrashReportClient;
+
+	TSharedPtr<SMultiLineEditableTextBox> CrashDetailsInformation;
+
+	bool bHasUserCommentErrors;
+};
+
+#endif // !CRASH_REPORT_UNATTENDED_ONLY