Make scroll offset type of float in cc

cc/layers/picture_layer_impl_perftest.cc

Index: cc/layers/picture_layer_impl_perftest.cc
diff --git a/cc/layers/picture_layer_impl_perftest.cc b/cc/layers/picture_layer_impl_perftest.cc
index 1aff9ad42ab61e178e1d0ecbb33de95a443bd3b8..129a11241693a1bdcbce70ba87ea4c31ac942f78 100644
--- a/cc/layers/picture_layer_impl_perftest.cc
+++ b/cc/layers/picture_layer_impl_perftest.cc
@@ -98,7 +98,8 @@ class PictureLayerImplPerfTest : public testing::Test {
   void RunRasterIteratorConstructTest(const std::string& test_name,
                                       const gfx::Rect& viewport) {
     host_impl_.SetViewportSize(viewport.size());
-    pending_layer_->SetScrollOffset(gfx::Vector2d(viewport.x(), viewport.y()));
+    pending_layer_->SetScrollOffset(
+        gfx::ScrollOffset(viewport.x(), viewport.y()));
     host_impl_.pending_tree()->UpdateDrawProperties();
 
     timer_.Reset();
@@ -151,7 +152,8 @@ class PictureLayerImplPerfTest : public testing::Test {
   void RunEvictionIteratorConstructTest(const std::string& test_name,
                                         const gfx::Rect& viewport) {
     host_impl_.SetViewportSize(viewport.size());
-    pending_layer_->SetScrollOffset(gfx::Vector2d(viewport.x(), viewport.y()));
+    pending_layer_->SetScrollOffset(
+        gfx::ScrollOffset(viewport.x(), viewport.y()));
     host_impl_.pending_tree()->UpdateDrawProperties();
 
     TreePriority priorities[] = {SAME_PRIORITY_FOR_BOTH_TREES,