From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: deepak1556 <hop2deep@gmail.com>
Date: Mon, 1 Sep 2025 23:31:49 +0900
Subject: Revert: partial "Remove unused PreHandleMouseEvent"

Refs https://chromium-review.googlesource.com/c/chromium/src/+/6880411

diff --git a/content/browser/renderer_host/render_widget_host_delegate.cc b/content/browser/renderer_host/render_widget_host_delegate.cc
index 74fea36ea7f9a345b3474ea18be00704831a685e..c75785d5a26fa52a39d1a3552da9a7621e4c8430 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.cc
+++ b/content/browser/renderer_host/render_widget_host_delegate.cc
@@ -13,6 +13,11 @@
 
 namespace content {
 
+bool RenderWidgetHostDelegate::PreHandleMouseEvent(
+    const blink::WebMouseEvent& event) {
+  return false;
+}
+
 KeyboardEventProcessingResult RenderWidgetHostDelegate::PreHandleKeyboardEvent(
     const input::NativeWebKeyboardEvent& event) {
   return KeyboardEventProcessingResult::NOT_HANDLED;
diff --git a/content/browser/renderer_host/render_widget_host_delegate.h b/content/browser/renderer_host/render_widget_host_delegate.h
index 7db3a07ff9e0f52f1232c25f8e4e72d3c299e623..af763ad4e441e54556854cd40c4cb9098f84bb58 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -103,6 +103,12 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   virtual void ResizeDueToAutoResize(RenderWidgetHostImpl* render_widget_host,
                                      const gfx::Size& new_size) {}
 
+  // Callback to give the browser a chance to handle the specified mouse
+  // event before sending it to the renderer. Returns true if the event was
+  // handled, false otherwise. A true value means no more processing should
+  // happen on the event. The default return value is false.
+  virtual bool PreHandleMouseEvent(const blink::WebMouseEvent& event);
+
   // Callback to give the browser a chance to handle the specified keyboard
   // event before sending it to the renderer. See enum for details on return
   // value.
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 349d591b0b35421f91e70dde257a726341e94ad9..6b0bbda767d547cf8365a240692904b3c0e50985 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -1595,6 +1595,10 @@ void RenderWidgetHostImpl::ForwardMouseEventWithLatencyInfo(
   CHECK_GE(mouse_event.GetType(), WebInputEvent::Type::kMouseTypeFirst);
   CHECK_LE(mouse_event.GetType(), WebInputEvent::Type::kMouseTypeLast);
 
+  if (delegate_ && delegate_->PreHandleMouseEvent(mouse_event)) {
+    return;
+  }
+
   for (auto& mouse_event_callback : mouse_event_callbacks_) {
     if (mouse_event_callback.Run(mouse_event)) {
       return;
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 7ec8dea94a9f97f0938f57743a35e8de09efb8c9..81eabc6be87037a54a8c9b000ce374cc2d87794f 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -4426,6 +4426,12 @@ void WebContentsImpl::RenderWidgetWasResized(
                              width_changed);
 }
 
+bool WebContentsImpl::PreHandleMouseEvent(const blink::WebMouseEvent& event) {
+  OPTIONAL_TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("content.verbose"),
+                        "WebContentsImpl::PreHandleMouseEvent");
+  return delegate_ ? delegate_->PreHandleMouseEvent(this, event) : false;
+}
+
 void WebContentsImpl::PreHandleDragUpdate(const DropData& drop_data,
                                           const gfx::PointF& client_pt) {
   if (delegate_) {
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index 9dfd229af26127dee8e21c77fcedef5285f3aafa..63a38ac602ae00e6df40e4c883937bc57d513ead 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -1109,6 +1109,7 @@ class CONTENT_EXPORT WebContentsImpl
 
   double GetPendingZoomLevel(RenderWidgetHostImpl* rwh) override;
 
+  bool PreHandleMouseEvent(const blink::WebMouseEvent& event) override;
   void PreHandleDragUpdate(const DropData& drop_data,
                            const gfx::PointF& client_pt);
   void PreHandleDragExit();
diff --git a/content/public/browser/web_contents_delegate.cc b/content/public/browser/web_contents_delegate.cc
index ea179bdf3e702fb1d5be55affe3958f77901cd08..4b99edf823034115387c19cf1a8df9284e674d9b 100644
--- a/content/public/browser/web_contents_delegate.cc
+++ b/content/public/browser/web_contents_delegate.cc
@@ -121,6 +121,12 @@ bool WebContentsDelegate::HandleContextMenu(RenderFrameHost& render_frame_host,
   return false;
 }
 
+bool WebContentsDelegate::PreHandleMouseEvent(
+    WebContents* source,
+    const blink::WebMouseEvent& event) {
+  return false;
+}
+
 KeyboardEventProcessingResult WebContentsDelegate::PreHandleKeyboardEvent(
     WebContents* source,
     const input::NativeWebKeyboardEvent& event) {
diff --git a/content/public/browser/web_contents_delegate.h b/content/public/browser/web_contents_delegate.h
index 97def739ec2418286b76c0039c61b501293c8f5d..23acbc47f2c2e5b56b674a675e5ea92a643c4715 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -306,6 +306,13 @@ class CONTENT_EXPORT WebContentsDelegate {
   virtual bool HandleContextMenu(RenderFrameHost& render_frame_host,
                                  const ContextMenuParams& params);
 
+  // Allows delegates to handle mouse events before sending to the renderer.
+  // Returns true if the event was handled, false otherwise. A true value means
+  // no more processing should happen on the event. The default return value is
+  // false.
+  virtual bool PreHandleMouseEvent(WebContents* source,
+                                   const blink::WebMouseEvent& event);
+
   // Allows delegates to handle mouse drag events before sending to the
   // renderer. Returns true if the event was handled, false otherwise. A true
   // value means no more processing should happen on the event. The default