[DevTools] Switch from NodeHighlightTool to the default when mouse moves

The inspect mode does not work if there is a highlighted frame. With
this change, the inspect tool gets reset from the frame highlighting
to the default tool once the mouse moves. The new behavior affects
NodeHighlightTool only.

Fixed: chromium:999440
Change-Id: I6bfe1f5587fea18b1aa23c389812231ac52b3b8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2150430Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Alex Rudenko <alexrudenko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759589}

third_party/blink/renderer/core/inspector/inspect_tools.cc

@@ -297,6 +297,10 @@ bool NodeHighlightTool::HideOnHideHighlight() {
   return true;
 }
 
+bool NodeHighlightTool::HideOnMouseMove() {
+  return true;
+}
+
 void NodeHighlightTool::Draw(float scale) {
   DrawNode();
   DrawMatchingSelector();

third_party/blink/renderer/core/inspector/inspect_tools.h

@@ -75,6 +75,7 @@ class NodeHighlightTool : public InspectTool {
 
  private:
   bool ForwardEventsToOverlay() override;
+  bool HideOnMouseMove() override;
   bool HideOnHideHighlight() override;
   void Draw(float scale) override;
   void DrawNode();

third_party/blink/renderer/core/inspector/inspector_overlay_agent.cc

@@ -196,6 +196,10 @@ bool InspectTool::ForwardEventsToOverlay() {
   return true;
 }
 
+bool InspectTool::HideOnMouseMove() {
+  return false;
+}
+
 bool InspectTool::HideOnHideHighlight() {
   return false;
 }
@@ -759,6 +763,11 @@ WebInputEventResult InspectorOverlayAgent::HandleInputEvent(
     }
   }
 
+  if (input_event.GetType() == WebInputEvent::kMouseMove &&
+      inspect_tool_->HideOnMouseMove()) {
+    PickTheRightTool();
+  }
+
   return WebInputEventResult::kNotHandled;
 }
 

third_party/blink/renderer/core/inspector/inspector_overlay_agent.h

@@ -95,6 +95,7 @@ class CORE_EXPORT InspectTool : public GarbageCollected<InspectTool> {
   virtual void Trace(Visitor* visitor);
   virtual void Dispose() {}
   virtual bool HideOnHideHighlight();
+  virtual bool HideOnMouseMove();
 
  protected:
   virtual void DoInit() {}