Add recommended extension installation support

extensions/browser/test_management_policy.h

Index: extensions/browser/test_management_policy.h
diff --git a/extensions/browser/test_management_policy.h b/extensions/browser/test_management_policy.h
index a9951c7fa9663c0697f56e7a85d95f0751d7738f..6dcf35ac3ea68d011a193392f68f58913a605725 100644
--- a/extensions/browser/test_management_policy.h
+++ b/extensions/browser/test_management_policy.h
@@ -21,7 +21,8 @@ class TestManagementPolicyProvider : public ManagementPolicy::Provider {
     PROHIBIT_LOAD = 1 << 0,
     PROHIBIT_MODIFY_STATUS = 1 << 1,
     MUST_REMAIN_ENABLED = 1 << 2,
-    MUST_REMAIN_DISABLED = 1 << 3
+    MUST_REMAIN_DISABLED = 1 << 3,
+    MUST_REMAIN_INSTALLED = 1 << 4,
   };
 
   static std::string expected_error() {
@@ -49,11 +50,15 @@ class TestManagementPolicyProvider : public ManagementPolicy::Provider {
                                   Extension::DisableReason* reason,
                                   base::string16* error) const override;
 
+  virtual bool MustRemainInstalled(const Extension* extension,
+                                   base::string16* error) const override;
+
  private:
   bool may_load_;
   bool may_modify_status_;
   bool must_remain_enabled_;
   bool must_remain_disabled_;
+  bool must_remain_installed_;
   Extension::DisableReason disable_reason_;
 
   base::string16 error_message_;