Fix WebView compositor input handling

content/renderer/android/synchronous_input_event_filter.cc

Index: content/renderer/android/synchronous_input_event_filter.cc
diff --git a/content/renderer/android/synchronous_input_event_filter.cc b/content/renderer/android/synchronous_input_event_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e889d762e8f9ea095fd1bd9421fe023d3b2d6905
--- /dev/null
+++ b/content/renderer/android/synchronous_input_event_filter.cc
@@ -0,0 +1,47 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/renderer/android/synchronous_input_event_filter.h"
+
+#include "base/callback.h"
+#include "base/logging.h"
+
+using WebKit::WebInputEvent;
+
+namespace content {
+
+SynchronousInputEventFilter::SynchronousInputEventFilter(
+    const Handler& handler)
+    : handler_(handler) {
+  DCHECK(!handler_.is_null());
+}
+
+SynchronousInputEventFilter::~SynchronousInputEventFilter() {
+}
+
+InputEventAckState SynchronousInputEventFilter::HandleInputEvent(
+    int routing_id,
+    const WebKit::WebInputEvent* input_event) {
+  // Clear the result for the (unexpected) case that callbacks to
+  // did/didNotHandleInputEvent are not made synchronously.
+  event_result_ = INPUT_EVENT_ACK_STATE_UNKNOWN;
+
+  // It is expected that handler_ initiates a synchronous callback to
+  // Did/DidNotHandleInputEvent.
+  handler_.Run(routing_id, input_event);
+  DCHECK(event_result_ != INPUT_EVENT_ACK_STATE_UNKNOWN);
+
+  return event_result_;
+}
+
+void SynchronousInputEventFilter::DidHandleInputEvent() {
+  event_result_ = INPUT_EVENT_ACK_STATE_CONSUMED;
+}
+
+void SynchronousInputEventFilter::DidNotHandleInputEvent(bool send_to_widget) {
+  event_result_ = send_to_widget ? INPUT_EVENT_ACK_STATE_NOT_CONSUMED
+                                 : INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS;
+}
+
+}  // namespace content