Bubble scroll events from WebView guest to embedder.

content/renderer/browser_plugin/browser_plugin_manager.h

Index: content/renderer/browser_plugin/browser_plugin_manager.h
diff --git a/content/renderer/browser_plugin/browser_plugin_manager.h b/content/renderer/browser_plugin/browser_plugin_manager.h
index a762b889f035f010b3ebbba6f94d366d4a56ad87..d8821a584e89c62e1c8b6d6289b905828862a0ff 100644
--- a/content/renderer/browser_plugin/browser_plugin_manager.h
+++ b/content/renderer/browser_plugin/browser_plugin_manager.h
@@ -14,11 +14,16 @@ namespace blink {
 class WebFrame;
 }
 
+namespace IPC {
+class SyncChannel;
+}
+
 namespace content {
 
 class BrowserPlugin;
 class BrowserPluginDelegate;
 class RenderFrame;
+class GuestScrollCompletionFilter;
 
 // BrowserPluginManager manages the routing of messages to the appropriate
 // BrowserPlugin object based on its instance ID. There is one BrowserPlugin
@@ -30,6 +35,10 @@ class CONTENT_EXPORT BrowserPluginManager : public RenderProcessObserver {
   BrowserPluginManager();
   ~BrowserPluginManager() override;
 
+  // Creates and registers scroll completion filter.
+  void Init(scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
+            IPC::SyncChannel* channel);
+
   // Creates a new BrowserPlugin object.
   // BrowserPlugin is responsible for associating itself with the
   // BrowserPluginManager via AddBrowserPlugin. When it is destroyed, it is
@@ -59,6 +68,8 @@ class CONTENT_EXPORT BrowserPluginManager : public RenderProcessObserver {
   void DidCommitCompositorFrame(int render_frame_routing_id);
   bool Send(IPC::Message* msg);
 
+  bool GetScrollHandledStatus();
+
   // RenderProcessObserver override.
   bool OnControlMessageReceived(const IPC::Message& message) override;
 
@@ -68,6 +79,7 @@ class CONTENT_EXPORT BrowserPluginManager : public RenderProcessObserver {
 
   // This map is keyed by guest instance IDs.
   IDMap<BrowserPlugin> instances_;
+  scoped_refptr<GuestScrollCompletionFilter> scroll_completion_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginManager);
 };