Add calls to inform gpu of browser window count

content/browser/gpu/gpu_data_manager_impl.h

Index: content/browser/gpu/gpu_data_manager_impl.h
diff --git a/content/browser/gpu/gpu_data_manager_impl.h b/content/browser/gpu/gpu_data_manager_impl.h
index 118fcb0f84e0c8a116d3be2f8227d65f94cfb424..d66380d938522f6e938bf79624f5e1e54874eb33 100644
--- a/content/browser/gpu/gpu_data_manager_impl.h
+++ b/content/browser/gpu/gpu_data_manager_impl.h
@@ -50,6 +50,8 @@ class CONTENT_EXPORT GpuDataManagerImpl
   virtual void AddObserver(content::GpuDataManagerObserver* observer) OVERRIDE;
   virtual void RemoveObserver(
       content::GpuDataManagerObserver* observer) OVERRIDE;
+  virtual void SetWindowCount(uint32 count) OVERRIDE;
+  virtual uint32 GetWindowCount() const OVERRIDE;
 
   // This collects preliminary GPU info, load GpuBlacklist, and compute the
   // preliminary blacklisted features; it should only be called at browser
@@ -155,6 +157,9 @@ class CONTENT_EXPORT GpuDataManagerImpl
   // they cause random failures.
   bool update_histograms_;
 
+  // Number of currently open windows, to be used in gpu memory allocation.
+  int window_count_;
+
   DISALLOW_COPY_AND_ASSIGN(GpuDataManagerImpl);
 };