Replace layer id with Element id for tracking scrollbar animation controllers

cc/layers/scrollbar_layer_interface.h

Index: cc/layers/scrollbar_layer_interface.h
diff --git a/cc/layers/scrollbar_layer_interface.h b/cc/layers/scrollbar_layer_interface.h
index 30c335ba01134ec0d613f0690281cf5723e23e3a..698f8fc3093e680e56c07056b5408ec88734ed0b 100644
--- a/cc/layers/scrollbar_layer_interface.h
+++ b/cc/layers/scrollbar_layer_interface.h
@@ -14,7 +14,8 @@ namespace cc {
 class CC_EXPORT ScrollbarLayerInterface {
  public:
   virtual int ScrollLayerId() const = 0;
-  virtual void SetScrollLayer(int layer_id) = 0;
+  virtual ElementId ScrollElementId() const = 0;

[wkorman, 2017/04/14 18:17:30]

I think cc style is to name straight accessors like this that don't have any
logic as scroll_element_id(). Same for this method name throughout change.

There's a method rename script I hear but here's perl as well in case helpful,
something like:

% find ./cc -name "*.h" | xargs perl -p -i -e
's/ScrollElementId/scroll_element_id/'

Repeat for .cc, etc. Add "\(\)" after Id if you want more specificity but you
don't want to unless you have to so you'll get the comment mentions as well.

[pdr., 2017/04/15 06:02:00]

Thanks for the script, it made this super easy. Done.

[wkorman, 2017/04/17 17:53:36]

Glad you got use out of this, learning the Perl in-place edit command line
switch and reading this book are among highest value things ever:

https://www.amazon.com/Mastering-Regular-Expressions-Jeffrey-Friedl/dp/059652...

+  virtual void SetScrollInfo(int layer_id, ElementId element_id) = 0;
 
   virtual ScrollbarOrientation orientation() const = 0;