Change the scale factor of texture_size from the layer's one to an estimation.

content/browser/renderer_host/image_transport_factory.h

Index: content/browser/renderer_host/image_transport_factory.h
diff --git a/content/browser/renderer_host/image_transport_factory.h b/content/browser/renderer_host/image_transport_factory.h
index 597ee71f1c44ec53d5cfae4db152314122a9bdab..cb9208f05cc8764f344c762b71396d9f800aaf83 100644
--- a/content/browser/renderer_host/image_transport_factory.h
+++ b/content/browser/renderer_host/image_transport_factory.h
@@ -89,6 +89,9 @@ class ImageTransportFactory {
   // Inserts a SyncPoint into the shared context.
   virtual uint32 InsertSyncPoint() = 0;
 
+  // Sets the device scale factor.
+  virtual void SetDeviceScaleFactor(float device_scale_factor) = 0;

[piman, 2012/09/21 00:59:34]

Because ImageTransportFactory is a singleton, that doesn't really work. It's
probably better to pass it to CreateTransportClient/CreateOwnedTexture.

[Jun Mukai, 2012/09/21 02:28:52]

removed this and added an argument to CreateTransportClient/OwnedTexture.

+
   virtual void AddObserver(ImageTransportFactoryObserver* observer) = 0;
   virtual void RemoveObserver(ImageTransportFactoryObserver* observer) = 0;
 };