Add Blimp feedback data about visible BlimpContents.

blimp/client/core/contents/blimp_contents_manager.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_MANAGER_H_
 #define BLIMP_CLIENT_CORE_CONTENTS_BLIMP_CONTENTS_MANAGER_H_
 
 #include <map>
+#include <vector>
 
 #include "base/memory/weak_ptr.h"
 #include "blimp/client/core/contents/blimp_contents_impl.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace blimp {
 namespace client {
 
 class BlimpCompositorDependencies;
 class BlimpContents;
@@ skipping 18 matching lines @@
 
   // Builds a BlimpContentsImpl and notifies the engine.
   // TODO(mlliu): Currently we want to have a single BlimpContents. If there is
   // an existing contents, return nullptr (http://crbug.com/642558).
   std::unique_ptr<BlimpContentsImpl> CreateBlimpContents(
       gfx::NativeWindow window);
 
   // The caller can query the contents through its id.
   BlimpContentsImpl* GetBlimpContents(int id);
 
+  // Returns a vector of the currently active BlimpContentsImpls. There is no
+  // guarantee for the lifetime of these pointers after this stack frame.
+  std::vector<BlimpContentsImpl*> GetAllActiveBlimpContents();
+
  private:
   class BlimpContentsDeletionObserver;
   friend class BlimpContentsDeletionObserver;
 
   // When creating the BlimpContentsImpl, an id is created for the content.
   int CreateBlimpContentsId();
 
   // When a BlimpContentsImpl is destroyed, its observer will pass the contents
   // pointer to the manager. The contents pointer is used to retrieve its id,
   // which in turn is used to destroy the observer entry from the observer_map_
@@ skipping 26 matching lines @@
 
   base::WeakPtrFactory<BlimpContentsManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpContentsManager);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_CORE_CONTENTS_BLIMP_CONTENTS_MANAGER_H_