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..44b10b0e1c984474568b0ab3d0568beef58cbd17 100644
--- a/content/browser/renderer_host/image_transport_factory.h
+++ b/content/browser/renderer_host/image_transport_factory.h
@@ -69,16 +69,18 @@ class ImageTransportFactory {
   // Destroys a shared surface handle.
   virtual void DestroySharedSurfaceHandle(gfx::GLSurfaceHandle surface) = 0;
 
-  // Creates a transport texture of a given size, and using the opaque handle
-  // sent by the GPU process.
+  // Creates a transport texture of a given size and scale factor, and using the
+  // opaque handle sent by the GPU process.
   virtual scoped_refptr<ui::Texture> CreateTransportClient(
       const gfx::Size& size,
+      float device_scale_factor,
       uint64 transport_handle) = 0;
 
   // Variant of CreateTransportClient() that deletes the texture on the GPU when
   // the returned value is deleted.
   virtual scoped_refptr<ui::Texture> CreateOwnedTexture(
       const gfx::Size& size,
+      float device_scale_factor,
       unsigned int texture_id) = 0;
 
   // Gets a GLHelper instance, associated with the shared context. This