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

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index a0c54fa90f4e5b200154a4163eaf152026dca4de..d71be5383f658c8d9aedd324ad87113d6af4ab95 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -223,6 +223,7 @@ RenderWidgetHostViewAura::RenderWidgetHostViewAura(RenderWidgetHost* host)
       text_input_type_(ui::TEXT_INPUT_TYPE_NONE),
       can_compose_inline_(true),
       has_composition_text_(false),
+      device_scale_factor_(1.0f),
       current_surface_(0),
       current_surface_is_protected_(true),
       current_surface_in_use_by_compositor_(true),
@@ -863,7 +864,8 @@ void RenderWidgetHostViewAura::AcceleratedSurfaceNew(
       uint64 surface_handle) {
   ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
   scoped_refptr<ui::Texture> surface(factory->CreateTransportClient(
-      gfx::Size(width_in_pixel, height_in_pixel), surface_handle));
+      gfx::Size(width_in_pixel, height_in_pixel), device_scale_factor_,
+      surface_handle));
   if (!surface) {
     LOG(ERROR) << "Failed to create ImageTransport texture";
     return;
@@ -1286,6 +1288,7 @@ void RenderWidgetHostViewAura::OnDeviceScaleFactorChanged(
   if (!host_)
     return;
 
+  device_scale_factor_ = device_scale_factor;
   BackingStoreAura* backing_store = static_cast<BackingStoreAura*>(
       host_->GetBackingStore(false));
   if (backing_store)  // NULL in hardware path.
@@ -1341,7 +1344,8 @@ scoped_refptr<ui::Texture> RenderWidgetHostViewAura::CopyTexture() {
     return scoped_refptr<ui::Texture>();
 
   return scoped_refptr<ui::Texture>(
-      factory->CreateOwnedTexture(container->size(), texture_id));
+      factory->CreateOwnedTexture(
+          container->size(), device_scale_factor_, texture_id));
 }
 
 ////////////////////////////////////////////////////////////////////////////////