Add argument to pass elastic overscroll delta to Blink (Chrome side)

cc/trees/layer_tree_host_client.h

Index: cc/trees/layer_tree_host_client.h
diff --git a/cc/trees/layer_tree_host_client.h b/cc/trees/layer_tree_host_client.h
index 5b02964e89f019c9f45798e7297c8b6380171dcf..5846343cef59e1501b4b36f3c08f239b2f1ecf01 100644
--- a/cc/trees/layer_tree_host_client.h
+++ b/cc/trees/layer_tree_host_client.h
@@ -11,6 +11,7 @@
 
 namespace gfx {
 class Vector2d;
+class Vector2dF;
 }
 
 namespace cc {
@@ -27,10 +28,12 @@ class LayerTreeHostClient {
   virtual void BeginMainFrame(const BeginFrameArgs& args) = 0;
   virtual void DidBeginMainFrame() = 0;
   virtual void Layout() = 0;
-  virtual void ApplyViewportDeltas(const gfx::Vector2d& inner_delta,
-                                   const gfx::Vector2d& outer_delta,
-                                   float page_scale,
-                                   float top_controls_delta) = 0;
+  virtual void ApplyViewportDeltas(
+      const gfx::Vector2d& inner_delta,
+      const gfx::Vector2d& outer_delta,
+      const gfx::Vector2dF& elastic_overscroll_delta,
+      float page_scale,
+      float top_controls_delta) = 0;
   virtual void ApplyViewportDeltas(const gfx::Vector2d& scroll_delta,
                                    float page_scale,
                                    float top_controls_delta) = 0;