Add additional status APIs for the TPM.

tpm.h

Index: tpm.h
diff --git a/tpm.h b/tpm.h
index 97c4d7dee4483a72184ad440579152e0431b941f..e3b4864fde13eec083199855c9d9fb982d8bf559 100644
--- a/tpm.h
+++ b/tpm.h
@@ -64,6 +64,9 @@ class Tpm {
   // Returns whether or not the SRK is available
   bool IsSrkAvailable() const { return is_srk_available_; }
 
+  // Returns whether or not the TPM is being owned
+  bool IsBeingOwned() const { return is_being_owned_; }
+
   // Runs the TPM initialization sequence.  This may take a long time due to the
   // call to Tspi_TPM_TakeOwnership.
   bool InitializeTpm();
@@ -211,6 +214,9 @@ class Tpm {
   // Indicates if the SRK is available
   bool is_srk_available_;
 
+  // Indicates if the TPM is being owned
+  bool is_being_owned_;
+
   DISALLOW_COPY_AND_ASSIGN(Tpm);
 };