Direct call to eval passes strict mode through.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 8c63022db8a0ac94928987882ddf258aabc599fd..0b81674e44983e36e56fbeb40d39e2ac1092e613 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4170,6 +4170,10 @@ class SharedFunctionInfo: public HeapObject {
   inline bool optimization_disabled();
   inline void set_optimization_disabled(bool value);
 
+  // Indicates whether the function is a strict mode function.
+  inline bool strict_mode();
+  inline void set_strict_mode(bool value);
+
   // Indicates whether or not the code in the shared function support
   // deoptimization.
   inline bool has_deoptimization_support();
@@ -4351,6 +4355,7 @@ class SharedFunctionInfo: public HeapObject {
   static const int kCodeAgeShift = 4;
   static const int kCodeAgeMask = 0x7;
   static const int kOptimizationDisabled = 7;
+  static const int kStrictModeFunction = 8;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(SharedFunctionInfo);
 };