Make scroll offset type of float in cc

cc/trees/layer_tree_host_unittest.cc

 // Copyright 2011 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 <algorithm>
 
 #include "base/auto_reset.h"
 #include "base/synchronization/lock.h"
@@ skipping 834 matching lines @@
       scroll_layer_ = layer;
     } else {
       scroll_layer_ = FakeContentLayer::Create(&client_);
     }
 
     Layer* root_layer = layer_tree_host()->root_layer();
     scroll_layer_->SetScrollClipLayerId(root_layer->id());
     scroll_layer_->SetIsContainerForFixedPositionLayers(true);
     scroll_layer_->SetBounds(gfx::Size(2 * root_layer->bounds().width(),
                                        2 * root_layer->bounds().height()));
-    scroll_layer_->SetScrollOffset(gfx::Vector2d());
+    scroll_layer_->SetScrollOffset(gfx::ScrollOffset());
     layer_tree_host()->root_layer()->AddChild(scroll_layer_);
     // This test requires the page_scale and inner viewport layers to be
     // identified.
     layer_tree_host()->RegisterViewportLayers(
         root_layer, scroll_layer_.get(), NULL);
     layer_tree_host()->SetPageScaleFactorAndLimits(1.f, 0.5f, 2.f);
   }
 
   virtual void BeginTest() OVERRIDE { PostSetNeedsCommitToMainThread(); }
 
   virtual void ApplyViewportDeltas(const gfx::Vector2d& scroll_delta,
                                    float scale,
                                    float) OVERRIDE {
-    gfx::Vector2d offset = scroll_layer_->scroll_offset();
-    scroll_layer_->SetScrollOffset(offset + scroll_delta);
+    gfx::ScrollOffset offset = scroll_layer_->scroll_offset();
+    scroll_layer_->SetScrollOffset(ScrollOffsetWithDelta(offset,
+                                                         scroll_delta));
     layer_tree_host()->SetPageScaleFactorAndLimits(scale, 0.5f, 2.f);
   }
 
   virtual void DidActivateTreeOnThread(LayerTreeHostImpl* impl) OVERRIDE {
     // We get one commit before the first draw, and the animation doesn't happen
     // until the second draw.
     switch (impl->active_tree()->source_frame_number()) {
       case 0:
         EXPECT_EQ(1.f, impl->active_tree()->page_scale_factor());
         // We'll start an animation when we get back to the main thread.
@@ skipping 4218 matching lines @@
   int activation_count_;
 
   FakeContentLayerClient client_;
   scoped_refptr<FakePictureLayer> picture_layer_;
 };
 
 // TODO(vmpstr): Enable with single thread impl-side painting.
 MULTI_THREAD_TEST_F(LayerTreeHostTestInvisibleDoesntActivate);
 
 }  // namespace cc