Extension/Platform App window isolation

chrome/browser/extensions/browser_extension_window_controller.cc

Index: chrome/browser/extensions/browser_extension_window_controller.cc
diff --git a/chrome/browser/extensions/browser_extension_window_controller.cc b/chrome/browser/extensions/browser_extension_window_controller.cc
index ed647bd3d8e9910b614824eeaea96ce579f3e160..86948f7f26170093ee91e9b5e1b9cf53513b6d44 100644
--- a/chrome/browser/extensions/browser_extension_window_controller.cc
+++ b/chrome/browser/extensions/browser_extension_window_controller.cc
@@ -10,6 +10,7 @@
 #include "chrome/browser/sessions/session_id.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
+#include "chrome/common/extensions/extension.h"
 
 BrowserExtensionWindowController::BrowserExtensionWindowController(
     Browser* browser)
@@ -68,3 +69,10 @@ void BrowserExtensionWindowController::SetFullscreenMode(
 Browser* BrowserExtensionWindowController::GetBrowser() const {
   return browser_;
 }
+
+bool BrowserExtensionWindowController::IsVisibleToExtension(
+    const extensions::Extension* extension) const {
+  // Platform apps can only see their own windows.
+  // TODO(mihaip): what about non-Aura panels?
+  return !extension->is_platform_app();
+}