1 files changed, 34 insertions, 0 deletions
diff --git a/chromium/extensions/browser/deferred_start_render_host_observer.h b/chromium/extensions/browser/deferred_start_render_host_observer.h
new file mode 100644
index 00000000000..09f04a27af3
--- /dev/null
+++ b/chromium/extensions/browser/deferred_start_render_host_observer.h
@@ -0,0 +1,34 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXTENSIONS_BROWSER_DEFERRED_START_RENDER_HOST_OBSERVER_H_
+#define EXTENSIONS_BROWSER_DEFERRED_START_RENDER_HOST_OBSERVER_H_
+
+namespace extensions {
+class DeferredStartRenderHost;
+
+// Observer of DeferredStartRenderHost lifetime.
+//
+// Note that if BackgroundContents and ExtensionHost are unified
+// (crbug.com/77790), this can be replaced by ExtensionHostObserver.
+class DeferredStartRenderHostObserver {
+ public:
+  virtual ~DeferredStartRenderHostObserver() {}
+
+  // Called when a DeferredStartRenderHost started loading.
+  virtual void OnDeferredStartRenderHostDidStartFirstLoad(
+      const DeferredStartRenderHost* host) {}
+
+  // Called when a DeferredStartRenderHost stopped loading.
+  virtual void OnDeferredStartRenderHostDidStopFirstLoad(
+      const DeferredStartRenderHost* host) {}
+
+  // Called when a DeferredStartRenderHost is destroyed.
+  virtual void OnDeferredStartRenderHostDestroyed(
+      const DeferredStartRenderHost* host) {}
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_DEFERRED_START_RENDER_HOST_OBSERVER_H_