change backing store cache to be memory-based rather than count

chrome/browser/renderer_host/backing_store.h

Index: chrome/browser/renderer_host/backing_store.h
diff --git a/chrome/browser/renderer_host/backing_store.h b/chrome/browser/renderer_host/backing_store.h
index 977553f5d7cb051e48af31637fe412d267e5fa5e..69fb88759cf73c2c3a8e9cae7b464509c804c9a2 100644
--- a/chrome/browser/renderer_host/backing_store.h
+++ b/chrome/browser/renderer_host/backing_store.h
@@ -49,6 +49,10 @@ class BackingStore {
   RenderWidgetHost* render_widget_host() const { return render_widget_host_; }
   const gfx::Size& size() { return size_; }
 
+  // The number of bytes that this backing store consumes.  This should rougly

[darin (slow to review), 2009/06/24 22:21:24]

nit: roughly

+  // be size_.GetArea() * bytes per pixel.
+  size_t MemorySize();
+
 #if defined(OS_WIN)
   HDC hdc() { return hdc_; }