Reland of Fix event page process cleanup when running in --isolate-extensions mode.

chrome/browser/extensions/lazy_background_page_apitest.cc

Index: chrome/browser/extensions/lazy_background_page_apitest.cc
diff --git a/chrome/browser/extensions/lazy_background_page_apitest.cc b/chrome/browser/extensions/lazy_background_page_apitest.cc
index a14bd040585e6607e7b7a2040dbbb2d4545a8479..9a8deb52d535beab58aae68fdcb1bcd589f55550 100644
--- a/chrome/browser/extensions/lazy_background_page_apitest.cc
+++ b/chrome/browser/extensions/lazy_background_page_apitest.cc
@@ -37,6 +37,7 @@
 #include "extensions/browser/extension_registry_observer.h"
 #include "extensions/browser/process_manager.h"
 #include "extensions/common/extension.h"
+#include "extensions/common/switches.h"
 #include "extensions/test/extension_test_message_listener.h"
 #include "extensions/test/result_catcher.h"
 #include "net/dns/mock_host_resolver.h"
@@ -104,8 +105,8 @@
     ExtensionApiTest::SetUpCommandLine(command_line);
     // Disable background network activity as it can suddenly bring the Lazy
     // Background Page alive.
-    command_line->AppendSwitch(switches::kDisableBackgroundNetworking);
-    command_line->AppendSwitch(switches::kNoProxyServer);
+    command_line->AppendSwitch(::switches::kDisableBackgroundNetworking);
+    command_line->AppendSwitch(::switches::kNoProxyServer);
   }
 
   // Loads the extension, which temporarily starts the lazy background page
@@ -659,4 +660,39 @@
 // TODO: background page with timer.
 // TODO: background page that interacts with popup.
 
+// Test class to allow test cases to run in --isolate-extensions mode.
+class LazyBackgroundPageIsolatedExtensionsApiTest
+    : public LazyBackgroundPageApiTest {
+ public:
+  LazyBackgroundPageIsolatedExtensionsApiTest() {}
+  ~LazyBackgroundPageIsolatedExtensionsApiTest() override {}
+
+  void SetUpInProcessBrowserTestFixture() override {
+    LazyBackgroundPageApiTest::SetUpInProcessBrowserTestFixture();
+
+    // This is needed to allow example.com to actually resolve and load in
+    // tests.
+    host_resolver()->AddRule("*", "127.0.0.1");
+  }
+
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    LazyBackgroundPageApiTest::SetUpCommandLine(command_line);
+    command_line->AppendSwitch(switches::kIsolateExtensions);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(LazyBackgroundPageIsolatedExtensionsApiTest);
+};
+
+// Ensure that the events page of an extension is properly torn down and the
+// process does not linger around when running in --isolate-extensions mode.
+// See https://crbug.com/612668.
+IN_PROC_BROWSER_TEST_F(LazyBackgroundPageIsolatedExtensionsApiTest,
+                       EventProcessCleanup) {
+  ASSERT_TRUE(LoadExtensionAndWait("event_page_with_web_iframe"));
+
+  // Lazy Background Page doesn't exist anymore.
+  EXPECT_FALSE(IsBackgroundPageAlive(last_loaded_extension_id()));
+}
+
 }  // namespace extensions