Make scroll offset type of float in cc

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 07dc6c8f51558136e5ddf376f71f8f5c274b45df..d5a1c3ca911c167866a0e2070de2d3c5b0754df2 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -2546,6 +2546,7 @@ bool LayerTreeHostImpl::ScrollBy(const gfx::Point& viewport_point,
       gfx::Vector2dF applied_delta;
       gfx::Vector2dF excess_delta;
       if (consume_by_top_controls) {
+        LOG(ERROR) << "consumed_by top_control";

[danakj, 2014/09/18 21:21:52]

remove

[Yufeng Shen (Slow to review), 2014/09/18 22:47:55]

Done.

         excess_delta = top_controls_manager_->ScrollBy(pending_delta);
         applied_delta = pending_delta - excess_delta;
         pending_delta = excess_delta;
@@ -2616,7 +2617,7 @@ bool LayerTreeHostImpl::ScrollBy(const gfx::Point& viewport_point,
     float angle_threshold = 45;
     if (MathUtil::SmallestAngleBetweenVectors(
             applied_delta, pending_delta) < angle_threshold) {
-      pending_delta = gfx::Vector2d();
+      pending_delta = gfx::Vector2dF();
       break;
     }
 
@@ -2917,8 +2918,7 @@ static void CollectScrollDeltas(ScrollAndScaleSet* scroll_info,
   if (!layer_impl)
     return;
 
-  gfx::Vector2d scroll_delta =
-      gfx::ToFlooredVector2d(layer_impl->ScrollDelta());
+  gfx::Vector2dF scroll_delta = layer_impl->ScrollDelta();
   if (!scroll_delta.IsZero()) {
     LayerTreeHostCommon::ScrollUpdateInfo scroll;
     scroll.layer_id = layer_impl->id();