Merge bleeding edge up to 8774 into the GC branch.

src/v8.h

Index: src/v8.h
===================================================================
--- src/v8.h	(revision 8778)
+++ src/v8.h	(working copy)
@@ -93,6 +93,9 @@
   static void FatalProcessOutOfMemory(const char* location,
                                       bool take_snapshot = false);
 
+  // Allows an entropy source to be provided for use in random number
+  // generation.
+  static void SetEntropySource(EntropySource source);
   // Random number generation support. Not cryptographically safe.
   static uint32_t Random(Isolate* isolate);
   // We use random numbers internally in memory allocation and in the