diff --git a/sky/shell/gpu/rasterizer.cc b/sky/shell/gpu/rasterizer.cc
index dc4530c8a0f..d2e930d6f17 100644
--- a/sky/shell/gpu/rasterizer.cc
+++ b/sky/shell/gpu/rasterizer.cc
@@ -17,14 +17,6 @@
 
 namespace sky {
 namespace shell {
-namespace {
-
-gfx::Size GetSize(SkPicture* picture) {
-  const SkRect& rect = picture->cullRect();
-  return gfx::Size(rect.width(), rect.height());
-}
-
-}  // namespace
 
 Rasterizer::Rasterizer()
     : share_group_(new gfx::GLShareGroup()), weak_factory_(this) {
@@ -43,16 +35,12 @@ void Rasterizer::OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) {
   CHECK(surface_) << "GLSurface required.";
 }
 
-void Rasterizer::Draw(PassRefPtr<SkPicture> picture) {
+void Rasterizer::Draw(PassRefPtr<SkPicture> picture, gfx::Size size) {
   TRACE_EVENT0("sky", "Rasterizer::Draw");
 
   if (!surface_)
     return;
 
-  gfx::Size size = GetSize(picture.get());
-  if (size.IsEmpty())
-    return;
-
   if (surface_->GetSize() != size)
     surface_->Resize(size);
 
diff --git a/sky/shell/gpu/rasterizer.h b/sky/shell/gpu/rasterizer.h
index 09d5a755cba..ff8b687ac2a 100644
--- a/sky/shell/gpu/rasterizer.h
+++ b/sky/shell/gpu/rasterizer.h
@@ -34,7 +34,7 @@ class Rasterizer : public GPUDelegate {
 
   void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) override;
   void OnOutputSurfaceDestroyed() override;
-  void Draw(PassRefPtr<SkPicture> picture) override;
+  void Draw(PassRefPtr<SkPicture> picture, gfx::Size size) override;
 
  private:
   void EnsureGLContext();
diff --git a/sky/shell/gpu_delegate.h b/sky/shell/gpu_delegate.h
index cebc6eb2071..43cca28cffa 100644
--- a/sky/shell/gpu_delegate.h
+++ b/sky/shell/gpu_delegate.h
@@ -6,6 +6,7 @@
 #define SKY_SHELL_GPU_DELEGATE_H_
 
 #include "sky/engine/wtf/PassRefPtr.h"
+#include "ui/gfx/geometry/size.h"
 #include "ui/gfx/native_widget_types.h"
 
 class SkPicture;
@@ -17,7 +18,7 @@ class GPUDelegate {
  public:
   virtual void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) = 0;
   virtual void OnOutputSurfaceDestroyed() = 0;
-  virtual void Draw(PassRefPtr<SkPicture> picture) = 0;
+  virtual void Draw(PassRefPtr<SkPicture> picture, gfx::Size size) = 0;
 
  protected:
   virtual ~GPUDelegate();
diff --git a/sky/shell/ui/animator.cc b/sky/shell/ui/animator.cc
index 521bef8df21..1fc37546fcb 100644
--- a/sky/shell/ui/animator.cc
+++ b/sky/shell/ui/animator.cc
@@ -76,7 +76,8 @@ void Animator::BeginFrame(int64_t time_stamp) {
 
   config_.gpu_task_runner->PostTaskAndReply(
       FROM_HERE,
-      base::Bind(&GPUDelegate::Draw, config_.gpu_delegate, picture),
+      base::Bind(&GPUDelegate::Draw, config_.gpu_delegate, picture,
+                 engine_->physical_size()),
       base::Bind(&Animator::OnFrameComplete, weak_factory_.GetWeakPtr()));
 }
 
diff --git a/sky/shell/ui/engine.h b/sky/shell/ui/engine.h
index bbb0248bddf..105b2b14ba1 100644
--- a/sky/shell/ui/engine.h
+++ b/sky/shell/ui/engine.h
@@ -56,6 +56,7 @@ class Engine : public UIDelegate,
 
   void BeginFrame(base::TimeTicks frame_time);
   PassRefPtr<SkPicture> Paint();
+  const gfx::Size& physical_size() { return physical_size_; }
 
   void StartDartTracing();
   void StopDartTracing(mojo::ScopedDataPipeProducerHandle producer);