Introducing WebCoalescedInputEvent and inclusion in content/common

content/renderer/mus/compositor_mus_connection.cc

Index: content/renderer/mus/compositor_mus_connection.cc
diff --git a/content/renderer/mus/compositor_mus_connection.cc b/content/renderer/mus/compositor_mus_connection.cc
index 1ffb713f6175b628d5923c8d81fb9f82dc758321..931ac994330b8db65fcd921a5416b1f066960274 100644
--- a/content/renderer/mus/compositor_mus_connection.cc
+++ b/content/renderer/mus/compositor_mus_connection.cc
@@ -96,7 +96,7 @@ void CompositorMusConnection::OnConnectionLostOnMainThread() {
 }
 
 void CompositorMusConnection::OnWindowInputEventOnMainThread(
-    ui::ScopedWebInputEvent web_event,
+    blink::WebScopedInputEvent web_event,
     const base::Callback<void(EventResult)>& ack) {
   DCHECK(main_task_runner_->BelongsToCurrentThread());
   RenderWidgetMusConnection* connection =
@@ -187,7 +187,7 @@ void CompositorMusConnection::OnWindowInputEvent(
   // Take ownership of the callback, indicating that we will handle it.
   std::unique_ptr<base::Callback<void(EventResult)>> callback =
       std::move(*ack_callback);
-  ui::ScopedWebInputEvent web_event(Convert(event).release());
+  blink::WebScopedInputEvent web_event(Convert(event).release());
   // TODO(sad): We probably need to plumb LatencyInfo through Mus.
   ui::LatencyInfo info;
   input_handler_manager_->HandleInputEvent(
@@ -200,7 +200,7 @@ void CompositorMusConnection::OnWindowInputEvent(
 void CompositorMusConnection::DidHandleWindowInputEventAndOverscroll(
     std::unique_ptr<base::Callback<void(EventResult)>> ack_callback,
     InputEventAckState ack_state,
-    ui::ScopedWebInputEvent web_event,
+    blink::WebScopedInputEvent web_event,
     const ui::LatencyInfo& latency_info,
     std::unique_ptr<ui::DidOverscrollParams> overscroll_params) {
   // TODO(jonross): We probably need to ack the event based on the consumed