Make scroll offset type of float in cc

cc/trees/layer_tree_host_unittest_damage.cc

 // Copyright 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 "cc/trees/layer_tree_host.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 346 matching lines @@
 class LayerTreeHostScrollbarDamageTest : public LayerTreeHostDamageTest {
   virtual void SetupTree() OVERRIDE {
     scoped_refptr<Layer> root_layer = Layer::Create();
     root_layer->SetBounds(gfx::Size(400, 400));
     root_layer->SetMasksToBounds(true);
     layer_tree_host()->SetRootLayer(root_layer);
 
     scoped_refptr<Layer> scroll_clip_layer = Layer::Create();
     scoped_refptr<Layer> content_layer = FakeContentLayer::Create(&client_);
     content_layer->SetScrollClipLayerId(scroll_clip_layer->id());
-    content_layer->SetScrollOffset(gfx::Vector2d(10, 20));
+    content_layer->SetScrollOffset(gfx::ScrollOffset(10, 20));
     content_layer->SetBounds(gfx::Size(100, 200));
     scroll_clip_layer->SetBounds(
         gfx::Size(content_layer->bounds().width() - 30,
                   content_layer->bounds().height() - 50));
     scroll_clip_layer->AddChild(content_layer);
     root_layer->AddChild(scroll_clip_layer);
 
     scoped_refptr<Layer> scrollbar_layer =
         FakePaintedScrollbarLayer::Create(false, true, content_layer->id());
     scrollbar_layer->SetPosition(gfx::Point(300, 300));
@@ skipping 259 matching lines @@
   FakeContentLayerClient client_;
   int swap_count_;
   int prepare_to_draw_count_;
   int update_visible_tile_count_;
 };
 
 MULTI_THREAD_TEST_F(LayerTreeHostDamageTestVisibleTilesStillTriggerDraws);
 
 }  // namespace
 }  // namespace cc