Add ASSERTs in BidiResolver and RenderBlockLineLayout

Source/platform/text/BidiResolver.h

Index: Source/platform/text/BidiResolver.h
diff --git a/Source/platform/text/BidiResolver.h b/Source/platform/text/BidiResolver.h
index a8660cd52bdbeea688a4858081f3c15ab70e5d18..97d3ad496f3362ce5ad5805fc17bb2b91e2be225 100644
--- a/Source/platform/text/BidiResolver.h
+++ b/Source/platform/text/BidiResolver.h
@@ -199,7 +199,11 @@ public:
     void setDir(WTF::Unicode::Direction d) { m_direction = d; }
 
     const BidiStatus& status() const { return m_status; }
-    void setStatus(const BidiStatus s) { m_status = s; }
+    void setStatus(const BidiStatus s)
+    {
+        ASSERT(s.context);
+        m_status = s;
+    }
 
     MidpointState<Iterator>& midpointState() { return m_midpointState; }