Expose MemoryCoordinator's global budget information.

content/browser/memory/memory_coordinator_impl.h

Index: content/browser/memory/memory_coordinator_impl.h
diff --git a/content/browser/memory/memory_coordinator_impl.h b/content/browser/memory/memory_coordinator_impl.h
index f9792a8c67a7acca64f85fd57f6e6942d2f44f00..8c781030cd40254dcb37312cdfb453119c4bc64c 100644
--- a/content/browser/memory/memory_coordinator_impl.h
+++ b/content/browser/memory/memory_coordinator_impl.h
@@ -47,11 +47,11 @@ class CONTENT_EXPORT MemoryCoordinatorImpl : public MemoryCoordinator,
   // MemoryCoordinator implementations:
   void Start() override;
   void OnChildAdded(int render_process_id) override;
-
-  MemoryMonitor* memory_monitor() { return memory_monitor_.get(); }
-
   base::MemoryState GetCurrentMemoryState() const override;
   void SetCurrentMemoryStateForTesting(base::MemoryState memory_state) override;
+  int64_t GetRemainingGlobalBudget() const override;
+
+  MemoryMonitor* memory_monitor() { return memory_monitor_.get(); }
 
   // NotificationObserver implementation:
   void Observe(int type,
@@ -69,7 +69,10 @@ class CONTENT_EXPORT MemoryCoordinatorImpl : public MemoryCoordinator,
 
   // Calculates the next global state from the amount of free memory using
   // a heuristic.
-  MemoryState CalculateNextState();
+  MemoryState CalculateNextState(int free_memory_until_critical_mb);

[haraken, 2016/11/05 12:52:21]

int => int64_t ?

[chrisha, 2016/11/07 19:33:41]

(Decided to move everything in the other direction.)

+
+  // Calculates the remaining global budget.
+  int64_t CalculateRemainingGlobalBudget(int free_memory_until_critical_mb);
 
   // Updates the global state and notifies state changes to clients (lives in
   // the browser) and child processes (renderers) if necessary.
@@ -81,6 +84,9 @@ class CONTENT_EXPORT MemoryCoordinatorImpl : public MemoryCoordinator,
   // Notifies a state change to child processes.
   void NotifyStateToChildren();
 
+  // Notifies a change in remaining global budget to children.
+  void NotifyRemainingGlobalBudgetToChildren();
+
   // Schedules a task to update the global state. The task will be executed
   // after |delay| has passed.
   void ScheduleUpdateState(base::TimeDelta delay);
@@ -91,6 +97,7 @@ class CONTENT_EXPORT MemoryCoordinatorImpl : public MemoryCoordinator,
   base::Closure update_state_callback_;
   base::MemoryState current_state_ = MemoryState::NORMAL;
   base::TimeTicks last_state_change_;
+  int64_t remaining_global_budget_mb_;
 
   // Validates parameters defined below.
   bool ValidateParameters();