Add method to get random bytes from the TPM.

tpm_init.h

Index: tpm_init.h
diff --git a/tpm_init.h b/tpm_init.h
index 0dc1086d0a9d0fb4aeb4c8b9e8402aab21f35189..e2e6bd16797cc5d1db679fefdc967a92546d222c 100644
--- a/tpm_init.h
+++ b/tpm_init.h
@@ -23,6 +23,13 @@ class TpmInit {
 
   virtual ~TpmInit();
 
+  // Gets random data from the TPM
+  //
+  // Parameters
+  //   length - The number of bytes to get
+  //   data (OUT) - Receives the random bytes
+  virtual bool GetRandomData(int length, chromeos::Blob* data);
+
   // Starts asynchronous initialization of the TPM
   virtual bool StartInitializeTpm();