Add Mojo API for Blink hit testing

content/browser/site_per_process_browsertest.cc

 // Copyright (c) 2012 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/site_per_process_browsertest.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 255 matching lines @@
 // This helper accounts for Android devices which use page scale factor
 // different from 1.0. Coordinate targeting needs to be adjusted before
 // hit testing.
 double GetPageScaleFactor(Shell* shell) {
   return RenderWidgetHostImpl::From(
              shell->web_contents()->GetRenderViewHost()->GetWidget())
       ->last_frame_metadata()
       .page_scale_factor;
 }
 
+bool callback_received = false;
+int received_frame_id = -2;
+
+void callback(int frame_id) {
+  received_frame_id = frame_id;
+  callback_received = true;
+}
+
 // Helper function that performs a surface hittest.
 void SurfaceHitTestTestHelper(
     Shell* shell,
     net::test_server::EmbeddedTestServer* embedded_test_server) {
   GURL main_url(embedded_test_server->GetURL(
       "/frame_tree/page_with_positioned_frame.html"));
   EXPECT_TRUE(NavigateToURL(shell, main_url));
 
   // It is safe to obtain the root frame tree node here, as it doesn't change.
   FrameTreeNode* root = static_cast<WebContentsImpl*>(shell->web_contents())
@@ skipping 37 matching lines @@
                                    blink::WebInputEvent::kTimeStampForTesting);
   child_event.button = blink::WebPointerProperties::Button::kLeft;
   child_event.SetPositionInWidget(
       gfx::ToCeiledInt((bounds.x() - root_view->GetViewBounds().x() + 5) *
                        scale_factor),
       gfx::ToCeiledInt((bounds.y() - root_view->GetViewBounds().y() + 5) *
                        scale_factor));
   child_event.click_count = 1;
   main_frame_monitor.ResetEventReceived();
   child_frame_monitor.ResetEventReceived();
+
+  callback_received = false;
+  root->current_frame_host()->GetFrameInputHandler()->HitTestFrameAt(
+      (gfx::PointF)child_event.PositionInWidget(), base::Bind(&callback));
+  while (!callback_received) {
+    base::RunLoop run_loop;
+    base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
+        FROM_HERE, run_loop.QuitClosure(), TestTimeouts::tiny_timeout());
+    run_loop.Run();
+  }
+  ASSERT_EQ(4, received_frame_id);
+
   router->RouteMouseEvent(root_view, &child_event, ui::LatencyInfo());
 
   EXPECT_TRUE(child_frame_monitor.EventWasReceived());
   // The expected result coordinates are (5, 5), but can get slightly
   // different results due to rounding error with some page scale factors.
   EXPECT_NEAR(5, child_frame_monitor.event().PositionInWidget().x, 2);
   EXPECT_NEAR(5, child_frame_monitor.event().PositionInWidget().y, 2);
   EXPECT_FALSE(main_frame_monitor.EventWasReceived());
 
   child_frame_monitor.ResetEventReceived();
@@ skipping 10572 matching lines @@
   SimpleTap(gfx::Point(point_outside_iframe.x(), point_outside_iframe.y()));
   selection_controller_client->Wait();
 
   EXPECT_EQ(ui::TouchSelectionController::INACTIVE,
             parent_view->touch_selection_controller()->active_status());
 }
 
 #endif  // defined(OS_ANDROID)
 
 }  // namespace content