Make scroll offset type of float in cc

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index 1a22d9254a9b5bded9b1560c4769760efa57779d..92264f6adfb5a9f91ddece64d6d83a61384c26a5 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -654,7 +654,7 @@ void Layer::RemoveClipChild(Layer* child) {
   SetNeedsCommit();
 }
 
-void Layer::SetScrollOffset(gfx::Vector2d scroll_offset) {
+void Layer::SetScrollOffset(gfx::Vector2dF scroll_offset) {
   DCHECK(IsPropertyChangeAllowed());
 
   if (scroll_offset_ == scroll_offset)
@@ -663,7 +663,7 @@ void Layer::SetScrollOffset(gfx::Vector2d scroll_offset) {
   SetNeedsCommit();
 }
 
-void Layer::SetScrollOffsetFromImplSide(const gfx::Vector2d& scroll_offset) {
+void Layer::SetScrollOffsetFromImplSide(const gfx::Vector2dF& scroll_offset) {
   DCHECK(IsPropertyChangeAllowed());
   // This function only gets called during a BeginMainFrame, so there
   // is no need to call SetNeedsUpdate here.
@@ -964,7 +964,7 @@ void Layer::PushPropertiesTo(LayerImpl* layer) {
   } else {
     layer->SetScrollOffsetAndDelta(
         scroll_offset_, layer->ScrollDelta() - layer->sent_scroll_delta());
-    layer->SetSentScrollDelta(gfx::Vector2d());
+    layer->SetSentScrollDelta(gfx::Vector2dF());
   }
 
   // Wrap the copy_requests_ in a PostTask to the main thread.