refactor_expose_cursor_changes_to_the_webcontentsobserver.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Andy Locascio <andy@slack-corp.com>
Date: Wed, 13 May 2020 14:54:39 -0700
Subject: refactor: expose cursor changes to the WebContentsObserver

Chrome moved the SetCursor IPC message to mojo, which we use to tell OSR about `cursor-changed`.

Refs: https://chromium-review.googlesource.com/c/chromium/src/+/2172779

diff --git a/content/browser/renderer_host/render_widget_host_delegate.h b/content/browser/renderer_host/render_widget_host_delegate.h
index 5f1eea557b549a6db081ff925ba9995b0591d9fa..62c5ef52ec774623f2cfc7c269973a26a1d9e5f8 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -14,6 +14,7 @@
 #include "build/build_config.h"
 #include "components/viz/common/vertical_scroll_direction.h"
 #include "content/common/content_export.h"
+#include "content/common/cursors/webcursor.h"
 #include "content/public/common/drop_data.h"
 #include "services/metrics/public/cpp/ukm_recorder.h"
 #include "third_party/abseil-cpp/absl/types/optional.h"
@@ -257,6 +258,9 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   // Returns the associated RenderViewHostDelegateView*, if possible.
   virtual RenderViewHostDelegateView* GetDelegateView();
 
+  // Notify the delegate of the RenderWidget's changing cursor.
+  virtual void OnCursorChanged(const WebCursor& cursor) {}
+
   // Returns true if the provided RenderWidgetHostImpl matches the current
   // RenderWidgetHost on the primary main frame, and false otherwise.
   virtual bool IsWidgetForPrimaryMainFrame(RenderWidgetHostImpl*);
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 84b3bcbfb4f52098efad6f2b8ab8e8445d8fe13a..6ed422b4bfc5019a935634cad5488b2927461486 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -2098,6 +2098,8 @@ void RenderWidgetHostImpl::FilterDropData(DropData* drop_data) {
 void RenderWidgetHostImpl::SetCursor(const ui::Cursor& cursor) {
   if (view_)
     view_->UpdateCursor(WebCursor(cursor));
+  if (delegate_)
+    delegate_->OnCursorChanged(WebCursor(cursor));
 }
 
 void RenderWidgetHostImpl::ShowContextMenuAtPoint(
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 43a816bfe1259144792484ad90c79bffc266b82f..387fe3214e73f0ea4cd9a39d7f74c2e1fb2e8b9c 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -4593,6 +4593,11 @@ TextInputManager* WebContentsImpl::GetTextInputManager() {
   return text_input_manager_.get();
 }
 
+void WebContentsImpl::OnCursorChanged(const WebCursor& cursor) {
+  observers_.NotifyObservers(&WebContentsObserver::OnCursorChanged,
+                             cursor);
+}
+
 bool WebContentsImpl::IsWidgetForPrimaryMainFrame(
     RenderWidgetHostImpl* render_widget_host) {
   return render_widget_host == GetPrimaryMainFrame()->GetRenderWidgetHost();
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index ea6ef0e449890d737f3604108372b643e144983b..6b335d76154d2612879cb4ccb45807096d49b3c1 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -978,6 +978,7 @@ class CONTENT_EXPORT WebContentsImpl : public WebContents,
   void SendScreenRects() override;
   void SendActiveState(bool active) override;
   TextInputManager* GetTextInputManager() override;
+  void OnCursorChanged(const WebCursor& cursor) override;
   bool IsWidgetForPrimaryMainFrame(
       RenderWidgetHostImpl* render_widget_host) override;
   bool IsShowingContextMenuOnPage() const override;
diff --git a/content/public/browser/web_contents_observer.h b/content/public/browser/web_contents_observer.h
index b6e021165de91d92316c0b379e4fbdb616a56877..14f31672f3df2da3007ef5fa372359c2be92bdce 100644
--- a/content/public/browser/web_contents_observer.h
+++ b/content/public/browser/web_contents_observer.h
@@ -13,6 +13,7 @@
 #include "base/threading/thread_restrictions.h"
 #include "components/viz/common/vertical_scroll_direction.h"
 #include "content/common/content_export.h"
+#include "content/common/cursors/webcursor.h"
 #include "content/public/browser/allow_service_worker_result.h"
 #include "content/public/browser/reload_type.h"
 #include "content/public/browser/render_frame_host.h"
@@ -546,6 +547,9 @@ class CONTENT_EXPORT WebContentsObserver {
   // Invoked when the primary main frame changes size.
   virtual void PrimaryMainFrameWasResized(bool width_changed) {}
 
+  // Invoked every time the RenderWidget's cursor changes.
+  virtual void OnCursorChanged(const WebCursor& cursor) {}
+
   // Invoked when the given frame changes its window.name property.
   virtual void FrameNameChanged(RenderFrameHost* render_frame_host,
                                 const std::string& name) {}