Fix WebView compositor input handling

android_webview/browser/in_process_renderer/in_process_view_renderer.cc

Index: android_webview/browser/in_process_renderer/in_process_view_renderer.cc
diff --git a/android_webview/browser/in_process_renderer/in_process_view_renderer.cc b/android_webview/browser/in_process_renderer/in_process_view_renderer.cc
index 74acde0eed8615d77dbf2b3a978f7ca82afa824d..69bfa8ee1c481c51c6028337816398f82080e13c 100644
--- a/android_webview/browser/in_process_renderer/in_process_view_renderer.cc
+++ b/android_webview/browser/in_process_renderer/in_process_view_renderer.cc
@@ -110,6 +110,7 @@ InProcessViewRenderer::InProcessViewRenderer(
     JavaHelper* java_helper)
     : client_(client),
       java_helper_(java_helper),
+      content_view_core_(NULL),
       web_contents_(NULL),
       compositor_(NULL),
       view_visible_(false),
@@ -160,9 +161,19 @@ void InProcessViewRenderer::BindSynchronousCompositor(
     client_->RequestProcessMode();
 }
 
+void InProcessViewRenderer::BindSynchronousInputEventFilter(
+    content::SynchronousInputEventFilter* input_event_filter) {
+  input_event_filter_ = input_event_filter;
+  if (content_view_core_)
+    content_view_core_->SetInputEventFilter(input_event_filter_);
+}
+
 void InProcessViewRenderer::SetContents(
     content::ContentViewCore* content_view_core) {
   // First remove association from the prior ContentViewCore / WebContents.
+  if (content_view_core_)
+    content_view_core_->SetInputEventFilter(NULL);
+
   if (web_contents_) {
     web_contents_->SetUserData(kUserDataKey, NULL);
     DCHECK(!web_contents_);  // WebContentsGone should have been called.
@@ -171,6 +182,8 @@ void InProcessViewRenderer::SetContents(
   if (!content_view_core)
     return;
 
+  content_view_core_->SetInputEventFilter(input_event_filter_);
+
   web_contents_ = content_view_core->GetWebContents();
   web_contents_->SetUserData(kUserDataKey, new UserData(this));
 }