Made it possible to tell whether an extension is being installed or updated.

chrome/common/extensions/extension.cc

Index: chrome/common/extensions/extension.cc
diff --git a/chrome/common/extensions/extension.cc b/chrome/common/extensions/extension.cc
index c4c1d9a2914762c2dfff9c6ff2a10224d6c1403f..6ed0e794dec4bf9a0a65fc48f31bd6058ae2538e 100644
--- a/chrome/common/extensions/extension.cc
+++ b/chrome/common/extensions/extension.cc
@@ -1741,12 +1741,18 @@ ExtensionInfo::ExtensionInfo(const DictionaryValue* manifest,
 
 ExtensionInfo::~ExtensionInfo() {}
 
+InstalledExtensionInfo::InstalledExtensionInfo(
+    const Extension* extension,
+    bool is_update)
+    : extension(extension),
+      is_update(is_update) {}
+
 UnloadedExtensionInfo::UnloadedExtensionInfo(
     const Extension* extension,
     extension_misc::UnloadedExtensionReason reason)
-  : reason(reason),
-    already_disabled(false),
-    extension(extension) {}
+    : reason(reason),
+      already_disabled(false),
+      extension(extension) {}
 
 UpdatedExtensionPermissionsInfo::UpdatedExtensionPermissionsInfo(
     const Extension* extension,