Add API stubs for GCD device commands.

chrome/browser/extensions/api/gcd_private/gcd_private_api.cc

Index: chrome/browser/extensions/api/gcd_private/gcd_private_api.cc
diff --git a/chrome/browser/extensions/api/gcd_private/gcd_private_api.cc b/chrome/browser/extensions/api/gcd_private/gcd_private_api.cc
index 06bb0fa00e04f8426cc6eb40d12f80df1fed92c1..49351ffeab1ca88e454ed4688df6ff5c387a7aa1 100644
--- a/chrome/browser/extensions/api/gcd_private/gcd_private_api.cc
+++ b/chrome/browser/extensions/api/gcd_private/gcd_private_api.cc
@@ -372,4 +372,54 @@ bool GcdPrivateSetupStopFunction::RunAsync() {
   return false;
 }
 
+GcdPrivateGetCommandDefsFunction::GcdPrivateGetCommandDefsFunction() {
+}
+
+GcdPrivateGetCommandDefsFunction::~GcdPrivateGetCommandDefsFunction() {
+}
+
+bool GcdPrivateGetCommandDefsFunction::RunAsync() {
+  return false;
+}
+
+GcdPrivateInsertCommandFunction::GcdPrivateInsertCommandFunction() {
+}
+
+GcdPrivateInsertCommandFunction::~GcdPrivateInsertCommandFunction() {
+}
+
+bool GcdPrivateInsertCommandFunction::RunAsync() {
+  return false;
+}
+
+GcdPrivateGetCommandFunction::GcdPrivateGetCommandFunction() {
+}
+
+GcdPrivateGetCommandFunction::~GcdPrivateGetCommandFunction() {
+}
+
+bool GcdPrivateGetCommandFunction::RunAsync() {
+  return false;
+}
+
+GcdPrivateCancelCommandFunction::GcdPrivateCancelCommandFunction() {
+}
+
+GcdPrivateCancelCommandFunction::~GcdPrivateCancelCommandFunction() {
+}
+
+bool GcdPrivateCancelCommandFunction::RunAsync() {
+  return false;
+}
+
+GcdPrivateGetCommandsListFunction::GcdPrivateGetCommandsListFunction() {
+}
+
+GcdPrivateGetCommandsListFunction::~GcdPrivateGetCommandsListFunction() {
+}
+
+bool GcdPrivateGetCommandsListFunction::RunAsync() {
+  return false;
+}
+
 }  // namespace extensions