Make scroll offset type of float in cc

cc/layers/layer.cc

 // Copyright 2010 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/layers/layer.h"
 
 #include <algorithm>
 
 #include "base/atomic_sequence_num.h"
 #include "base/debug/trace_event.h"
@@ skipping 636 matching lines @@
   SetNeedsCommit();
 }
 
 void Layer::RemoveClipChild(Layer* child) {
   clip_children_->erase(child);
   if (clip_children_->empty())
     clip_children_.reset();
   SetNeedsCommit();
 }
 
-void Layer::SetScrollOffset(gfx::Vector2d scroll_offset) {
+void Layer::SetScrollOffset(const gfx::ScrollOffset& scroll_offset) {
   DCHECK(IsPropertyChangeAllowed());
 
   if (scroll_offset_ == scroll_offset)
     return;
   scroll_offset_ = scroll_offset;
   SetNeedsCommit();
 }
 
-void Layer::SetScrollOffsetFromImplSide(const gfx::Vector2d& scroll_offset) {
+void Layer::SetScrollOffsetFromImplSide(
+    const gfx::ScrollOffset& scroll_offset) {
   DCHECK(IsPropertyChangeAllowed());
   // This function only gets called during a BeginMainFrame, so there
   // is no need to call SetNeedsUpdate here.
   DCHECK(layer_tree_host_ && layer_tree_host_->CommitRequested());
   if (scroll_offset_ == scroll_offset)
     return;
   scroll_offset_ = scroll_offset;
   SetNeedsPushProperties();
   if (!did_scroll_callback_.is_null())
     did_scroll_callback_.Run();
@@ skipping 279 matching lines @@
     layer->SetClipChildren(NULL);
   }
 
   // Adjust the scroll delta to be just the scrolls that have happened since
   // the BeginMainFrame was sent.  This happens for impl-side painting
   // in LayerImpl::ApplyScrollDeltasSinceBeginMainFrame in a separate tree walk.
   if (layer->layer_tree_impl()->settings().impl_side_painting) {
     layer->SetScrollOffset(scroll_offset_);
   } else {
     layer->SetScrollOffsetAndDelta(
-        scroll_offset_, layer->ScrollDelta() - layer->sent_scroll_delta());
-    layer->SetSentScrollDelta(gfx::Vector2d());
+        scroll_offset_,
+        layer->ScrollDelta() - ToVector2dF(layer->sent_scroll_delta()));
+    layer->SetSentScrollDelta(gfx::ScrollOffset());
   }
 
   // Wrap the copy_requests_ in a PostTask to the main thread.
   ScopedPtrVector<CopyOutputRequest> main_thread_copy_requests;
   for (ScopedPtrVector<CopyOutputRequest>::iterator it = copy_requests_.begin();
        it != copy_requests_.end();
        ++it) {
     scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner =
         layer_tree_host()->proxy()->MainThreadTaskRunner();
     scoped_ptr<CopyOutputRequest> original_request = copy_requests_.take(it);
@@ skipping 255 matching lines @@
 
 void Layer::RunMicroBenchmark(MicroBenchmark* benchmark) {
   benchmark->RunOnLayer(this);
 }
 
 bool Layer::HasDelegatedContent() const {
   return false;
 }
 
 }  // namespace cc