Introduce a stable set of errors for inline install

chrome/common/extensions/api/webstore/webstore_api_constants.cc

Index: chrome/common/extensions/api/webstore/webstore_api_constants.cc
diff --git a/chrome/common/extensions/api/webstore/webstore_api_constants.cc b/chrome/common/extensions/api/webstore/webstore_api_constants.cc
index e766bce69a7e99f7daa0bd0d439dfc4bb822b667..5aa92b1591ebfe8f2d83e29cd78eee6b752abc71 100644
--- a/chrome/common/extensions/api/webstore/webstore_api_constants.cc
+++ b/chrome/common/extensions/api/webstore/webstore_api_constants.cc
@@ -4,10 +4,41 @@
 
 #include "chrome/common/extensions/api/webstore/webstore_api_constants.h"
 
+#include "base/macros.h"
+#include "chrome/common/extensions/webstore_install_result.h"
+
 namespace extensions {
 namespace api {
 namespace webstore {
 
+// IMPORTANT: Keep this list in sync with both the definition in
+// chrome/common/extensions/api/webstore.json and
+// chrome/common/extensions/webstore_install_result.h!
+const char* kInstallResultCodes[] = {
+  "success",
+  "otherError",
+  "aborted",
+  "installInProgress",
+  "notPermitted",
+  "invalidId",
+  "webstoreRequestError",
+  "invalidWebstoreResponse",
+  "invalidManifest",
+  "iconError",
+  "userCancelled",
+  "blacklisted",
+  "missingDependencies",
+  "requirementViolations",
+  "blockedByPolicy",
+  "launchFeatureDisabled",
+  "launchUnsupportedExtensionType",
+  "launchInProgress",
+};
+
+COMPILE_ASSERT(arraysize(kInstallResultCodes) ==
+                   webstore_install::RESULT_LAST + 1,
+               must_keep_webstore_install_result_and_api_constants_in_sync);
+
 // The "downloading" stage begins when the installer starts downloading modules
 // for the extension.
 const char kInstallStageDownloading[] = "downloading";