Move middle-click autoscroll to synthetic fling.

third_party/WebKit/Source/web/ChromeClientImpl.cpp

Index: third_party/WebKit/Source/web/ChromeClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/ChromeClientImpl.cpp b/third_party/WebKit/Source/web/ChromeClientImpl.cpp
index 9a4be59666c24ad06241fa1cef9d647f00b7483f..2f8f25d73feb117c2080a0285adba076388bd7f7 100644
--- a/third_party/WebKit/Source/web/ChromeClientImpl.cpp
+++ b/third_party/WebKit/Source/web/ChromeClientImpl.cpp
@@ -648,6 +648,29 @@ void ChromeClientImpl::SetCursorOverridden(bool overridden) {
   cursor_overridden_ = overridden;
 }
 
+void ChromeClientImpl::AutoscrollStart(WebFloatPoint viewport_point,
+                                       LocalFrame* local_frame) {
+  LocalFrame& local_root = local_frame->LocalFrameRoot();
+  if (WebFrameWidgetBase* widget =
+          WebLocalFrameImpl::FromFrame(&local_root)->FrameWidget())
+    widget->Client()->AutoscrollStart(viewport_point);
+}
+
+void ChromeClientImpl::AutoscrollFling(WebFloatSize velocity,
+                                       LocalFrame* local_frame) {
+  LocalFrame& local_root = local_frame->LocalFrameRoot();
+  if (WebFrameWidgetBase* widget =
+          WebLocalFrameImpl::FromFrame(&local_root)->FrameWidget())
+    widget->Client()->AutoscrollFling(velocity);
+}
+
+void ChromeClientImpl::AutoscrollEnd(LocalFrame* local_frame) {
+  LocalFrame& local_root = local_frame->LocalFrameRoot();
+  if (WebFrameWidgetBase* widget =
+          WebLocalFrameImpl::FromFrame(&local_root)->FrameWidget())
+    widget->Client()->AutoscrollEnd();
+}
+
 String ChromeClientImpl::AcceptLanguages() {
   return web_view_->Client()->AcceptLanguages();
 }