Make touch-based synthetic gesture take touch slop into account.

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index c8c559bc5edadb67bfe094bdfb535a46e5c15901..f7c387c8a859482bcc421419cdc2dbd0695bbb3b 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -797,6 +797,10 @@ void RenderWidgetHostViewAndroid::SynchronousFrameMetadata(
   ComputeContentsSize(frame_metadata);
 }
 
+float RenderWidgetHostViewAndroid::GetDeviceScaleFactor() const {
+  return content_view_core_->GetDeviceScaleFactor();
+}
+
 void RenderWidgetHostViewAndroid::UpdateContentViewCoreFrameMetadata(
     const cc::CompositorFrameMetadata& frame_metadata) {
   if (content_view_core_) {