Modify --isolate-extensions to not isolate hosted apps.

chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc

Index: chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
diff --git a/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc b/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
index bb82828623909b202a6c7492ce0966a5eadced09..15ea34cf2ea0606e30be13e144d70aad25ab8531 100644
--- a/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
+++ b/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
@@ -19,6 +19,7 @@
 #include "chrome/browser/renderer_host/chrome_extension_message_filter.h"
 #include "chrome/browser/sync_file_system/local/sync_file_system_backend.h"
 #include "chrome/common/chrome_constants.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_process_policy.h"
 #include "components/guest_view/browser/guest_view_message_filter.h"
 #include "content/public/browser/browser_thread.h"
@@ -184,6 +185,26 @@ bool ChromeContentBrowserClientExtensionsPart::ShouldUseProcessPerSite(
 }
 
 // static
+bool ChromeContentBrowserClientExtensionsPart::DoesSiteRequireDedicatedProcess(
+    content::BrowserContext* browser_context,
+    const GURL& effective_site_url) {
+  if (effective_site_url.SchemeIs(extensions::kExtensionScheme)) {
+    // --isolate-extensions should isolate extensions, except for hosted apps.
+    // Isolating hosted apps is a good idea, but ought to be a separate knob.
+    if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+            ::switches::kIsolateExtensions)) {
+      const Extension* extension =
+          ExtensionRegistry::Get(browser_context)
+              ->enabled_extensions()
+              .GetExtensionOrAppByURL(effective_site_url);
+      if (extension && !extension->is_hosted_app())
+        return true;
+    }
+  }
+  return false;
+}
+
+// static
 bool ChromeContentBrowserClientExtensionsPart::ShouldLockToOrigin(
     content::BrowserContext* browser_context,
     const GURL& effective_site_url) {