Make scroll offset type of float in cc

cc/trees/layer_tree_host_common_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_common.h"
 
 #include <set>
 
 #include "cc/animation/layer_animation_controller.h"
 #include "cc/animation/transform_operations.h"
@@ skipping 266 matching lines @@
                                gfx::Size(10, 12),
                                true,
                                false);
   ExecuteCalculateDrawProperties(root.get());
   EXPECT_TRANSFORMATION_MATRIX_EQ(expected_result, layer->draw_transform());
   EXPECT_TRANSFORMATION_MATRIX_EQ(expected_result,
                                   layer->screen_space_transform());
 }
 
 TEST_F(LayerTreeHostCommonTest, TransformsAboutScrollOffset) {
-  const gfx::Vector2d kScrollOffset(50, 100);
+  const gfx::ScrollOffset kScrollOffset(50, 100);
   const gfx::Vector2dF kScrollDelta(2.34f, 5.67f);
   const gfx::Vector2d kMaxScrollOffset(200, 200);
   const gfx::PointF kScrollLayerPosition(-kScrollOffset.x(),
                                          -kScrollOffset.y());
   const float kPageScale = 0.888f;
   const float kDeviceScale = 1.666f;
 
   FakeImplProxy proxy;
   TestSharedBitmapManager shared_bitmap_manager;
   FakeLayerTreeHostImpl host_impl(&proxy, &shared_bitmap_manager);
@@ skipping 6282 matching lines @@
   clip_parent->AddChild(render_surface1);
   render_surface1->AddChild(intervening);
   intervening->AddChild(render_surface2);
   render_surface2->AddChild(clip_child);
 
   clip_child->SetClipParent(clip_parent.get());
 
   intervening->SetMasksToBounds(true);
   clip_parent->SetMasksToBounds(true);
   intervening->SetScrollClipLayerId(clip_parent->id());
-  intervening->SetScrollOffset(gfx::Vector2d(3, 3));
+  intervening->SetScrollOffset(gfx::ScrollOffset(3, 3));
 
   render_surface1->SetForceRenderSurface(true);
   render_surface2->SetForceRenderSurface(true);
 
   gfx::Transform translation_transform;
   translation_transform.Translate(2, 2);
 
   gfx::Transform identity_transform;
   SetLayerPropertiesForTesting(root.get(),
                                identity_transform,
@@ skipping 2009 matching lines @@
   // by the viewport.
   EXPECT_EQ(gfx::Rect(768 / 2, 582 / 2), root->visible_content_rect());
 
   // Layers drawing to a child render surface should still have their visible
   // content rect clipped by the viewport.
   EXPECT_EQ(gfx::Rect(768 / 2, 582 / 2), content->visible_content_rect());
 }
 
 }  // namespace
 }  // namespace cc