Allow MimeHandlerViewGuest be embedded inside OOPIFs

content/browser/renderer_host/render_widget_host_input_event_router.cc

Index: content/browser/renderer_host/render_widget_host_input_event_router.cc
diff --git a/content/browser/renderer_host/render_widget_host_input_event_router.cc b/content/browser/renderer_host/render_widget_host_input_event_router.cc
index 3603ae2d83f8e927f3952f95a37ae7d17b8a546e..ed21940dad1ca7f140d096990a7dc8fa8ce57eff 100644
--- a/content/browser/renderer_host/render_widget_host_input_event_router.cc
+++ b/content/browser/renderer_host/render_widget_host_input_event_router.cc
@@ -197,7 +197,17 @@ void RenderWidgetHostInputEventRouter::RouteMouseEvent(
   // the embedding renderer and then BrowserPluginGuest.
   if (target && target->IsRenderWidgetHostViewGuest()) {
     ui::LatencyInfo latency_info;
-    root_view->ProcessMouseEvent(*event, latency_info);
+    RenderWidgetHostViewBase* embedder = target->GetOuterView();

[lfg, 2016/10/20 22:50:49]

This can be casted to RenderWidgetHostViewGuest, you don'tneed to add a method
to RenderWidgetHostViewBase.

[EhsanK, 2016/10/25 19:30:50]

We are in renderer_host and RWHVG is in frame_host. I would have to add it to
DEPS, wouldn't I? We have specific entry for RWHVCF. If we are adding RWHVG deps
here too then I can simply expose the GetOwnerRenderWidgetHostView() method in
RWHVG.

+    if (embedder != root_view) {
+      // This happens when the view is embedded inside a cross process frame.
+      gfx::Point embedder_point;
+      if (!root_view->TransformPointToCoordSpaceForView(
+              gfx::Point(event->x, event->y), embedder, &embedder_point))
+        return;
+      event->x = embedder_point.x();
+      event->y = embedder_point.y();
+    }
+    embedder->ProcessMouseEvent(*event, latency_info);
     return;
   }