[DevTools] Pass events to remote frames in inspect mode.

third_party/WebKit/Source/web/InspectorOverlay.cpp

Index: third_party/WebKit/Source/web/InspectorOverlay.cpp
diff --git a/third_party/WebKit/Source/web/InspectorOverlay.cpp b/third_party/WebKit/Source/web/InspectorOverlay.cpp
index c265cbed6a4e9d2171a31a987a78406ac9444907..27a732dcdb5f5a14140b2367805ea2b0c042b205 100644
--- a/third_party/WebKit/Source/web/InspectorOverlay.cpp
+++ b/third_party/WebKit/Source/web/InspectorOverlay.cpp
@@ -42,6 +42,7 @@
 #include "core/frame/LocalFrameClient.h"
 #include "core/frame/Settings.h"
 #include "core/frame/VisualViewport.h"
+#include "core/html/HTMLFrameOwnerElement.h"
 #include "core/input/EventHandler.h"
 #include "core/inspector/InspectorOverlayHost.h"
 #include "core/layout/api/LayoutViewItem.h"
@@ -735,6 +736,17 @@ bool InspectorOverlay::handleMouseMove(const WebMouseEvent& event) {
   if (!node)
     return true;
 
+  if (node->isFrameOwnerElement()) {
+    HTMLFrameOwnerElement* frameOwner = toHTMLFrameOwnerElement(node);
+    if (frameOwner->contentFrame() &&
+        !frameOwner->contentFrame()->isLocalFrame()) {
+      // Do not consume event so that remote frame can handle it.
+      hideHighlight();
+      m_hoveredNodeForInspectMode.clear();
+      return false;
+    }
+  }
+
   Node* eventTarget = (event.modifiers() & WebInputEvent::ShiftKey)
                           ? hoveredNodeForEvent(frame, event, false)
                           : nullptr;