Add Mojo API for Blink hit testing

content/common/frame_sink_provider.mojom

Index: content/common/frame_sink_provider.mojom
diff --git a/content/common/frame_sink_provider.mojom b/content/common/frame_sink_provider.mojom
index 2f636ed7d21c87f4b8f03f0fdc43136271249ee9..dd8374cccc34ee7772d60092e63e0b4cfe7f6dff 100644
--- a/content/common/frame_sink_provider.mojom
+++ b/content/common/frame_sink_provider.mojom
@@ -1,10 +1,12 @@
 module content.mojom;
 
+import "services/viz/public/interfaces/hit_test/target_frame_for_input_delegate.mojom";
 import "services/viz/public/interfaces/compositing/compositor_frame_sink.mojom";
 
 // This interface provides CompositorFrameSink for the renderer.
 interface FrameSinkProvider {
   CreateForWidget(
       int32 widget_id, viz.mojom.CompositorFrameSink& request,
-      viz.mojom.CompositorFrameSinkClient client);
+      viz.mojom.CompositorFrameSinkClient client,
+      viz.mojom.TargetFrameForInputDelegate input_delegate);
 };