Add a function triggering extension installed to ExtensionRegistryObserver

extensions/browser/extension_registry_unittest.cc

Index: extensions/browser/extension_registry_unittest.cc
diff --git a/extensions/browser/extension_registry_unittest.cc b/extensions/browser/extension_registry_unittest.cc
index f212f6c85c9cb8e8bf77378020c85e0d81fdbb15..c6ad3c9035aa8176cb0b8a654b58c134af1931cd 100644
--- a/extensions/browser/extension_registry_unittest.cc
+++ b/extensions/browser/extension_registry_unittest.cc
@@ -37,10 +37,12 @@ class TestObserver : public ExtensionRegistryObserver {
   void Reset() {
     loaded_.clear();
     unloaded_.clear();
+    installed_.clear();
   }
 
   const ExtensionList& loaded() { return loaded_; }
   const ExtensionList& unloaded() { return unloaded_; }
+  const ExtensionList& installed() { return installed_; }
 
  private:
   virtual void OnExtensionLoaded(content::BrowserContext* browser_context,
@@ -55,8 +57,17 @@ class TestObserver : public ExtensionRegistryObserver {
     unloaded_.push_back(extension);
   }
 
+  virtual void OnExtensionWillBeInstalled(
+      content::BrowserContext* browser_context,
+      const Extension* extension,
+      bool is_update,
+      const std::string& old_name) OVERRIDE {
+    installed_.push_back(extension);
+  }
+
   ExtensionList loaded_;
   ExtensionList unloaded_;
+  ExtensionList installed_;
 };
 
 TEST_F(ExtensionRegistryTest, FillAndClearRegistry) {
@@ -215,10 +226,14 @@ TEST_F(ExtensionRegistryTest, Observer) {
 
   EXPECT_TRUE(observer.loaded().empty());
   EXPECT_TRUE(observer.unloaded().empty());
+  EXPECT_TRUE(observer.installed().empty());
 
   scoped_refptr<const Extension> extension =
       test_util::CreateExtensionWithID("id");
 
+  registry.TriggerOnWillBeInstalled(extension, true, "foo");
+  EXPECT_TRUE(HasSingleExtension(observer.installed(), extension.get()));
+
   registry.AddEnabled(extension);
   registry.TriggerOnLoaded(extension);