Add --describe flag to {firmware|kernel}_utility.

src/platform/vboot_reference/include/kernel_utility.h

Index: src/platform/vboot_reference/include/kernel_utility.h
diff --git a/src/platform/vboot_reference/include/kernel_utility.h b/src/platform/vboot_reference/include/kernel_utility.h
index 1563278547be25bf55bc4f44224be33d1e3b4f7b..1cb7f1ae501a0749b36fba1e32855621c6f4d8d7 100644
--- a/src/platform/vboot_reference/include/kernel_utility.h
+++ b/src/platform/vboot_reference/include/kernel_utility.h
@@ -28,6 +28,9 @@ class KernelUtility {
   // Return true on success, false on failure.
   bool ParseCmdLineOptions(int argc, char* argv[]);
 
+  // Print description of a verified boot kernel image.
+  void DescribeSignedImage();
+
   // Generate a verified boot image by reading kernel data from in_file_.
   // Return true on success, false on failure.
   bool GenerateSignedImage();
@@ -41,6 +44,7 @@ class KernelUtility {
 
   bool is_generate() { return is_generate_; }
   bool is_verify() { return is_verify_; }
+  bool is_describe() { return is_describe_; }
 
  private:
 
@@ -67,6 +71,7 @@ class KernelUtility {
   std::string out_file_;
   bool is_generate_;  // Are we generating a new image?
   bool is_verify_;  // Are we just verifying an already signed image?
+  bool is_describe_;  // Should we print out description of the image?
 };
 
 }  // namespace vboot_reference