Expose MemoryCoordinator's global budget information.

content/browser/memory/memory_coordinator.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 CONTENT_BROWSER_MEMORY_MEMORY_COORDINATOR_H_
 #define CONTENT_BROWSER_MEMORY_MEMORY_COORDINATOR_H_
 
 #include "base/memory/memory_coordinator_client_registry.h"
 #include "base/process/process_handle.h"
 #include "content/common/content_export.h"
@@ skipping 30 matching lines @@
 
   // Returns number of children. Only used for testing.
   size_t NumChildrenForTesting();
 
   // Dispatches a memory state change to the provided process. Returns true if
   // the process is tracked by this coordinator and successfully dispatches,
   // returns false otherwise.
   bool SetMemoryState(
       int render_process_id, mojom::MemoryState memory_state);
 
+  // Dispatches a remaining global budget change to the provided process.
+  // Returns true if the process is tracked by this coordinator and successfully
+  // dispatches, false otherwise.
+  bool SetRemainingGlobalBudget(
+      int render_process_id, int64_t remaining_global_budget_mb);
+
   // Returns the memory state of the specified render process. Returns UNKNOWN
   // if the process is not tracked by this coordinator.
   mojom::MemoryState GetMemoryState(int render_process_id) const;
 
   // Called when ChildMemoryCoordinator calls AddChild().
   virtual void OnChildAdded(int render_process_id) {}
 
   virtual base::MemoryState GetCurrentMemoryState() const;
   virtual void SetCurrentMemoryStateForTesting(base::MemoryState memory_state);
 
+  // Returns the remaining global budget usable in aggregate by all Chrome
+  // processes. This indicates how many MB of memory are remaining for Chrome
+  // processes to use before the memory coordinator will take efforts to reclaim
+  // memory. A negative amount indicates that the coordinator is actively trying
+  // to reclaim that much memory.
+  virtual int64_t GetRemainingGlobalBudget() const;
+
  protected:
   // Constructor. Protected as this is a singleton, but accessible for
   // unittests.
   MemoryCoordinator();
 
   // Adds the given ChildMemoryCoordinator as a child of this coordinator.
   void AddChildForTesting(int dummy_render_process_id,
                           mojom::ChildMemoryCoordinatorPtr child);
 
   // Callback invoked by mojo when the child connection goes down. Exposed
@@ skipping 34 matching lines @@
   ChildInfoMap children_;
 
   std::unique_ptr<MemoryCoordinatorDelegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(MemoryCoordinator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEMORY_MEMORY_COORDINATOR_H_