Plumb smooth scrolling in Chromium compositor

content/browser/web_contents/web_contents_android.cc

Index: content/browser/web_contents/web_contents_android.cc
diff --git a/content/browser/web_contents/web_contents_android.cc b/content/browser/web_contents/web_contents_android.cc
index 8fd5c506a2dfb263920e9538108c22af5985d837..bcd2b56d28fbd008254afb96ba140b77b23959ad 100644
--- a/content/browser/web_contents/web_contents_android.cc
+++ b/content/browser/web_contents/web_contents_android.cc
@@ -393,6 +393,23 @@ void WebContentsAndroid::ScrollFocusedEditableNodeIntoView(
       host->GetRoutingID(), gfx::Rect()));
 }
 
+void WebContentsAndroid::SmoothScroll(JNIEnv* env,
+                                      jobject obj,
+                                      jint target_x,
+                                      jint target_y,
+                                      jlong duration_ms) {
+  RenderViewHost* host = web_contents_->GetRenderViewHost();
+  if (!host)
+    return;
+
+  ContentViewCoreImpl* contentViewCore =
+      ContentViewCoreImpl::FromWebContents(web_contents_);
+  float scale_factor = contentViewCore->GetScaleFactor();
+  host->Send(new InputMsg_SmoothScroll(host->GetRoutingID(),
+                                       target_x / scale_factor,
+                                       target_y / scale_factor, duration_ms));
+}
+
 void WebContentsAndroid::SelectWordAroundCaret(JNIEnv* env, jobject obj) {
   RenderViewHost* host = web_contents_->GetRenderViewHost();
   if (!host)