Implement sandbox hooks to forward OPM related GDI system calls.

sandbox/win/src/sandbox_policy_base.cc

Index: sandbox/win/src/sandbox_policy_base.cc
diff --git a/sandbox/win/src/sandbox_policy_base.cc b/sandbox/win/src/sandbox_policy_base.cc
index 739941ae231486d87e309cc20e0a0c73d4f6ea8c..adb9ad2cc3d2360440575234b41558b152c77441 100644
--- a/sandbox/win/src/sandbox_policy_base.cc
+++ b/sandbox/win/src/sandbox_policy_base.cc
@@ -135,7 +135,8 @@ PolicyBase::PolicyBase()
       policy_maker_(NULL),
       policy_(NULL),
       lowbox_sid_(NULL),
-      lockdown_default_dacl_(false) {
+      lockdown_default_dacl_(false),
+      enable_opm_redirection_(false) {
   ::InitializeCriticalSection(&lock_);
   dispatcher_.reset(new TopLevelDispatcher(this));
 }
@@ -607,6 +608,14 @@ HANDLE PolicyBase::GetStderrHandle() {
   return stderr_handle_;
 }
 
+void PolicyBase::SetEnableOPMRedirection() {
+  enable_opm_redirection_ = true;
+}
+
+bool PolicyBase::GetEnableOPMRedirection() {
+  return enable_opm_redirection_;
+}
+
 bool PolicyBase::SetupAllInterceptions(TargetProcess* target) {
   InterceptionManager manager(target, relaxed_interceptions_);