Add Mojo API for Blink hit testing

content/browser/frame_host/input/legacy_ipc_frame_input_handler.cc

 // Copyright 2017 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/browser/frame_host/input/legacy_ipc_frame_input_handler.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/renderer_host/input/legacy_input_router_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/common/input_messages.h"
@@ skipping 103 matching lines @@
 }
 
 void LegacyIPCFrameInputHandler::SelectAll() {
   SendInput(base::MakeUnique<InputMsg_SelectAll>(routing_id_));
 }
 
 void LegacyIPCFrameInputHandler::CollapseSelection() {
   SendInput(base::MakeUnique<InputMsg_CollapseSelection>(routing_id_));
 }
 
+void LegacyIPCFrameInputHandler::HitTestFrameAt(
+    const gfx::PointF& point,
+    HitTestFrameAtCallback callback) {
+  // We do not support this API over old IPC.

[rjkroege, 2017/06/26 18:29:52]

NOTREACHED(); ?

+}
+
 void LegacyIPCFrameInputHandler::SelectRange(const gfx::Point& point,
                                              const gfx::Point& extent) {
   SendInput(base::MakeUnique<InputMsg_SelectRange>(routing_id_, point, extent));
 }
 
 void LegacyIPCFrameInputHandler::AdjustSelectionByCharacterOffset(int32_t start,
                                                                   int32_t end) {
   SendInput(base::MakeUnique<InputMsg_AdjustSelectionByCharacterOffset>(
       routing_id_, start, end));
 }
 
 void LegacyIPCFrameInputHandler::MoveRangeSelectionExtent(
     const gfx::Point& extent) {
   SendInput(
       base::MakeUnique<InputMsg_MoveRangeSelectionExtent>(routing_id_, extent));
 }
 
 void LegacyIPCFrameInputHandler::SendInput(
     std::unique_ptr<IPC::Message> message) {
   static_cast<LegacyInputRouterImpl*>(
       frame_host_->GetRenderWidgetHost()->input_router())
       ->SendInput(std::move(message));
 }
 
 }  // namespace content