Expose loading state from Blimp to Tab

blimp/client/core/contents/blimp_contents_impl.h

 // Copyright 2016 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 BLIMP_CLIENT_CORE_CONTENTS_BLIMP_CONTENTS_IMPL_H_
 #define BLIMP_CLIENT_CORE_CONTENTS_BLIMP_CONTENTS_IMPL_H_
 
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "blimp/client/core/compositor/blimp_compositor_manager.h"
@@ skipping 52 matching lines @@
   void Hide() override;
 
   // Returns the platform specific window that this BlimpContents is showed in.
   gfx::NativeWindow GetNativeWindow();
 
   // Check if some observer is in the observer list.
   bool HasObserver(BlimpContentsObserver* observer);
 
   // BlimpNavigationControllerDelegate implementation.
   void OnNavigationStateChanged() override;
+  void OnLoadingStateChanged(bool loading) override;
 
   // Pushes the size and scale information to the engine, which will affect the
   // web content display area for all tabs.
   void SetSizeAndScale(const gfx::Size& size, float device_pixel_ratio);
 
   int id() { return id_; }
 
   // Returns the BlimpContentsView for this BlimpContentsImpl.
   BlimpContentsView* GetBlimpContentsView();
 
@@ skipping 32 matching lines @@
   // from the BlimpContents.
   std::unique_ptr<BlimpContentsView> blimp_contents_view_;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpContentsImpl);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_CORE_CONTENTS_BLIMP_CONTENTS_IMPL_H_