NotForReview: Expose the global memory budget (chromium side)

base/memory/memory_coordinator_proxy.h

Index: base/memory/memory_coordinator_proxy.h
diff --git a/base/memory/memory_coordinator_proxy.h b/base/memory/memory_coordinator_proxy.h
index 2bb26c451c01c5a205ad5a1a795d60900ea263a5..53d443be5a1ff0cee2e34a87fa8df36004b56c42 100644
--- a/base/memory/memory_coordinator_proxy.h
+++ b/base/memory/memory_coordinator_proxy.h
@@ -19,6 +19,8 @@ class BASE_EXPORT MemoryCoordinator {
   virtual ~MemoryCoordinator() {}
 
   virtual MemoryState GetCurrentMemoryState() const = 0;
+  virtual int64_t GetGlobalBudget() = 0;
+  virtual void SetGlobalBudgetUpdateInterval(uint32_t interval_ms) = 0;
 };
 
 // The proxy of MemoryCoordinator to be accessed from components that are not
@@ -35,6 +37,17 @@ class BASE_EXPORT MemoryCoordinatorProxy {
   // Returns the current memory state.
   MemoryState GetCurrentMemoryState() const;
 
+  // Returns the current global memory budget. A negative value can be returned
+  // if the global budget is unknown or the system is under high memory
+  // pressure.
+  int64_t GetGlobalBudget() const;
+
+  // TODO(bashi): Tentative.
+  void SetGlobalBudgetUpdateInterval(uint32_t interval_ms);
+
+  // Returns true when an instance of MemoryCoordinator is set.
+  bool IsEnabled();
+
  private:
   friend struct base::DefaultSingletonTraits<MemoryCoordinatorProxy>;