Build WTF as dll in component build

Source/wtf/CryptographicallyRandomNumber.cpp

Index: Source/wtf/CryptographicallyRandomNumber.cpp
diff --git a/Source/wtf/CryptographicallyRandomNumber.cpp b/Source/wtf/CryptographicallyRandomNumber.cpp
index fe445d6b0325f5a6ccbd6d8021df5d74f763bf9c..8b6e3b31f76328e42787fc022d049c43e7d7d29b 100644
--- a/Source/wtf/CryptographicallyRandomNumber.cpp
+++ b/Source/wtf/CryptographicallyRandomNumber.cpp
@@ -30,12 +30,18 @@
 #include "config.h"
 #include "CryptographicallyRandomNumber.h"
 
-#include "OSRandomSource.h"
 #include "StdLibExtras.h"
 #include "ThreadingPrimitives.h"
 
 namespace WTF {
 
+static RandomNumberSource sourceFunction;
+
+void setRandomSource(RandomNumberSource source)
+{
+    sourceFunction = source;
+}
+
 namespace {
 
 class ARC4Stream {
@@ -97,7 +103,7 @@ void ARC4RandomNumberGenerator::stir()
 {
     unsigned char randomness[128];
     size_t length = sizeof(randomness);
-    cryptographicallyRandomValuesFromOS(randomness, length);
+    (*sourceFunction)(randomness, length);
     addRandomData(randomness, length);
 
     // Discard early keystream, as per recommendations in:
@@ -164,6 +170,7 @@ ARC4RandomNumberGenerator& sharedRandomNumberGenerator()
 
 }
 
+
 uint32_t cryptographicallyRandomNumber()
 {
     return sharedRandomNumberGenerator().randomNumber();