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

content/browser/renderer_host/image_transport_factory.cc

Index: content/browser/renderer_host/image_transport_factory.cc
diff --git a/content/browser/renderer_host/image_transport_factory.cc b/content/browser/renderer_host/image_transport_factory.cc
index 190673021bf51c8db21f5e7713a999fb89fdbeb1..a01dc6745c2a1ce5a44a0291974593239ee09141 100644
--- a/content/browser/renderer_host/image_transport_factory.cc
+++ b/content/browser/renderer_host/image_transport_factory.cc
@@ -79,6 +79,9 @@ class DefaultTransportFactory
     return 0;
   }
 
+  virtual void SetDeviceScaleFactor(float device_scale_factor) OVERRIDE {
+  }
+
   // We don't generate lost context events, so we don't need to keep track of
   // observers
   virtual void AddObserver(ImageTransportFactoryObserver* observer) OVERRIDE {
@@ -97,8 +100,9 @@ class ImageTransportClientTexture : public ui::Texture {
   ImageTransportClientTexture(
       WebKit::WebGraphicsContext3D* host_context,
       const gfx::Size& size,
+      float device_scale_factor,
       uint64 surface_id)
-          : ui::Texture(true, size),
+          : ui::Texture(true, size, device_scale_factor),
             host_context_(host_context) {
     set_texture_id(surface_id);
   }
@@ -123,8 +127,9 @@ class OwnedTexture : public ui::Texture, ImageTransportFactoryObserver {
  public:
   OwnedTexture(WebKit::WebGraphicsContext3D* host_context,
                const gfx::Size& size,
+               float device_scale_factor,
                unsigned int texture_id)
-      : ui::Texture(true, size),
+      : ui::Texture(true, size, device_scale_factor),
         host_context_(host_context) {
     ImageTransportFactory::GetInstance()->AddObserver(this);
     set_texture_id(texture_id);
@@ -207,7 +212,8 @@ class GpuProcessTransportFactory :
     public WebKit::WebGraphicsContext3D::WebGraphicsContextLostCallback {
  public:
   GpuProcessTransportFactory()
-      : ALLOW_THIS_IN_INITIALIZER_LIST(callback_factory_(this)) {
+      : ALLOW_THIS_IN_INITIALIZER_LIST(callback_factory_(this)),
+        device_scale_factor_(1.0f) {
   }
 
   virtual ~GpuProcessTransportFactory() {
@@ -286,7 +292,8 @@ class GpuProcessTransportFactory :
         return NULL;
     scoped_refptr<ImageTransportClientTexture> image(
         new ImageTransportClientTexture(shared_context_.get(),
-                                        size, transport_handle));
+                                        size, device_scale_factor_,
+                                        transport_handle));
     return image;
   }
 
@@ -296,7 +303,8 @@ class GpuProcessTransportFactory :
     if (!shared_context_.get())
         return NULL;
     scoped_refptr<OwnedTexture> image(
-        new OwnedTexture(shared_context_.get(), size, texture_id));
+        new OwnedTexture(shared_context_.get(), size, device_scale_factor_,
+                         texture_id));
     return image;
   }
 
@@ -319,6 +327,10 @@ class GpuProcessTransportFactory :
     return shared_context_->insertSyncPoint();
   }
 
+  virtual void SetDeviceScaleFactor(float device_scale_factor) OVERRIDE {
+    device_scale_factor_ = device_scale_factor;
+  }
+
   virtual void AddObserver(ImageTransportFactoryObserver* observer) {
     observer_list_.AddObserver(observer);
   }
@@ -444,6 +456,7 @@ class GpuProcessTransportFactory :
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> shared_context_;
   ObserverList<ImageTransportFactoryObserver> observer_list_;
   base::WeakPtrFactory<GpuProcessTransportFactory> callback_factory_;
+  float device_scale_factor_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuProcessTransportFactory);
 };