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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 1273 matching lines @@
 void RenderWidgetHostViewAura::OnDeviceScaleFactorChanged(
     float device_scale_factor) {
   if (!host_)
     return;
 
   BackingStoreAura* backing_store = static_cast<BackingStoreAura*>(
       host_->GetBackingStore(false));
   if (backing_store)  // NULL in hardware path.
     backing_store->ScaleFactorChanged(device_scale_factor);
 
+  ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
+  factory->SetDeviceScaleFactor(device_scale_factor);
   host_->SetDeviceScaleFactor(device_scale_factor);
   current_cursor_.SetScaleFactor(device_scale_factor);
 }
 
 void RenderWidgetHostViewAura::OnWindowDestroying() {
 #if defined(OS_WIN)
   if (window_->GetRootWindow()) {
     HWND parent = window_->GetRootWindow()->GetAcceleratedWidget();
     DetachPluginsHelper(parent);
   }
@@ skipping 487 matching lines @@
     RenderWidgetHost* widget) {
   return new RenderWidgetHostViewAura(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content