mac: Improve framerate on accelerated pages in HiDPI mode.

content/browser/renderer_host/compositing_iosurface_mac.h

Index: content/browser/renderer_host/compositing_iosurface_mac.h
diff --git a/content/browser/renderer_host/compositing_iosurface_mac.h b/content/browser/renderer_host/compositing_iosurface_mac.h
index f224dc0ed115c4af2feb3c7c9f4f4a350ee7578b..adff8be7879943cd916a57b8c3980cf667abda40 100644
--- a/content/browser/renderer_host/compositing_iosurface_mac.h
+++ b/content/browser/renderer_host/compositing_iosurface_mac.h
@@ -54,6 +54,7 @@ class CompositingIOSurfaceMac {
   const gfx::Size& pixel_io_surface_size() const {
     return pixel_io_surface_size_;
   }
+  const gfx::Size& io_surface_size() const { return io_surface_size_; }

[jbates, 2012/06/12 17:11:13]

I think this should be renamed so that it's clear that it's not the pixel size.
Can it mention something about nsview coordinates? How about
nsview_io_surface_size() with a comment that it's the surface size mapped to
NSView coordinates.

 
   bool is_vsync_disabled() const { return is_vsync_disabled_; }
 
@@ -128,7 +129,8 @@ class CompositingIOSurfaceMac {
   base::mac::ScopedCFTypeRef<CFTypeRef> io_surface_;
 
   // The width and height of the io surface.
-  gfx::Size pixel_io_surface_size_;
+  gfx::Size pixel_io_surface_size_;  // In pixels.
+  gfx::Size io_surface_size_;  // In view units.
 
   // The "live" OpenGL texture referring to this IOSurfaceRef. Note
   // that per the CGLTexImageIOSurface2D API we do not need to