Implement surface-based browser process hit testing for Mac and Aura

content/browser/renderer_host/render_widget_host_input_event_router.h

+// Copyright 2015 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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_INPUT_EVENT_ROUTER_H_
+#define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_INPUT_EVENT_ROUTER_H_
+
+#include <stdint.h>
+
+#include "base/containers/hash_tables.h"
+#include "content/common/content_export.h"
+
+namespace blink {
+class WebMouseEvent;
+class WebMouseWheelEvent;
+}
+
+namespace gfx {
+class Point;
+}
+
+namespace content {
+
+class RenderWidgetHostViewBase;
+
+// Class owned by WebContentsImpl for the purpose of directing input events
+// to the correct RenderWidgetHost on pages with multiple RenderWidgetHosts.
+// It maintains a mapping of RenderWidgetHostViews to Surface IDs that they
+// own. When an input event requires routing based on window coordinates,
+// this class requests a Surface hit test from the provided |root_view| and
+// forwards the event to the owning RWHV of the returned Surface ID.
+class CONTENT_EXPORT RenderWidgetHostInputEventRouter {
+ public:
+  RenderWidgetHostInputEventRouter();
+  ~RenderWidgetHostInputEventRouter();
+
+  void RouteMouseEvent(RenderWidgetHostViewBase* root_view,
+                       blink::WebMouseEvent* event);
+  void RouteMouseWheelEvent(RenderWidgetHostViewBase* root_view,
+                            blink::WebMouseWheelEvent* event);
+
+  void AddSurfaceIdNamespaceOwner(uint32_t id, RenderWidgetHostViewBase* owner);
+  void RemoveSurfaceIdNamespaceOwner(uint32_t id);
+
+ private:
+  RenderWidgetHostViewBase* FindEventTarget(RenderWidgetHostViewBase* root_view,
+                                            const gfx::Point& point,
+                                            gfx::Point* transformed_point);
+
+  typedef base::hash_map<uint32_t, RenderWidgetHostViewBase*>
+      SurfaceIdNamespaceOwnerMap;
+  SurfaceIdNamespaceOwnerMap owner_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostInputEventRouter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_INPUT_EVENT_ROUTER_H_