Fix WebView compositor input handling

content/renderer/android/synchronous_input_event_filter.h

Index: content/renderer/android/synchronous_input_event_filter.h
diff --git a/content/renderer/android/synchronous_input_event_filter.h b/content/renderer/android/synchronous_input_event_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..709912c01a17043068ff7c98e6166f2fcaeee254
--- /dev/null
+++ b/content/renderer/android/synchronous_input_event_filter.h
@@ -0,0 +1,57 @@
+// Copyright (c) 2011 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.
+
+#ifndef CONTENT_RENDERER_ANDROID_SYNCHRONOUS_INPUT_EVENT_FILTER_H_
+#define CONTENT_RENDERER_ANDROID_SYNCHRONOUS_INPUT_EVENT_FILTER_H_
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "content/public/renderer/android/synchronous_input_event_handler.h"
+#include "content/renderer/gpu/input_handler_manager_client.h"
+
+namespace WebKit {
+class WebInputEvent;
+}
+
+namespace content {
+
+// This class perform synchronous, in-process InputEvent handling.
+//
+// The user of this class provides an instance of InputEventFilter::Handler,
+// which will be passed WebInputEvents on the compositing thread. If the event
+// goes unhandled, that is reflected in the InputEventAckState; no forwarding
+// is performed.
+//
+// It is up to the user to ensure thread-safety.
+class SynchronousInputEventFilter : public InputHandlerManagerClient,
+                                    public SynchronousInputEventHandler {
+ public:
+  typedef base::Callback<void(int /*routing_id*/,
+                              const WebKit::WebInputEvent*)> Handler;
+  SynchronousInputEventFilter(const Handler& handler);
+  virtual ~SynchronousInputEventFilter();
+
+  // SynchronousInputEventHandler implementation.
+  virtual content::InputEventAckState HandleInputEvent(
+      int routing_id,
+      const WebKit::WebInputEvent* input_event) OVERRIDE;
+
+  // InputHandlerManagerClient implementation.
+  virtual void DidAddInputHandler(int routing_id) OVERRIDE {}
+  virtual void DidRemoveInputHandler(int routing_id) OVERRIDE {}
+  virtual void DidHandleInputEvent() OVERRIDE;
+  virtual void DidNotHandleInputEvent(bool send_to_widget) OVERRIDE;
+
+ private:
+  Handler handler_;
+
+  // A temporary result reflecting the intermediate callback sequence of
+  // Did/DidNotHandleInputEvent, initiated by a call to HandleInputEvent.
+  InputEventAckState event_result_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_ANDROID_SYNCHRONOUS_INPUT_EVENT_FILTER_H_