WebViewImpl: Speculatively request a BeginMainFrame for input

third_party/WebKit/Source/web/WebViewImpl.cpp

Index: third_party/WebKit/Source/web/WebViewImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebViewImpl.cpp b/third_party/WebKit/Source/web/WebViewImpl.cpp
index 36cfad32c04150271df88057bed946431469a1a9..7f84f06771e2dae6b9b2a392ebaa1209cd34882a 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -2149,6 +2149,11 @@ WebInputEventResult WebViewImpl::handleInputEvent(
   if (m_ignoreInputEvents)
     return WebInputEventResult::NotHandled;
 
+  // Speculatively schedule an animation for this input event with the
+  // assumption that it will trigger one after being handled.
+  // TODO(skyostil): Only do this for certain types of input.
+  scheduleAnimationForWidget();
+
   AutoReset<const WebInputEvent*> currentEventChange(&m_currentInputEvent,
                                                      &inputEvent);
   UIEventWithKeyState::clearNewTabModifierSetFromIsolatedWorld();