diff --git a/patch/patch.cfg b/patch/patch.cfg
index 21054340a..d44c41a0f 100644
--- a/patch/patch.cfg
+++ b/patch/patch.cfg
@@ -397,5 +397,10 @@ patches = [
     # RTL document in <iframe> should have left-hand scrollbar.
     # https://bugs.chromium.org/p/chromium/issues/detail?id=250514#c34
     'name': 'webkit_rtl_scrollbars_250514',
+  },
+  {
+    # Fix redraw of OSR PDF viewer.
+    # https://bitbucket.org/chromiumembedded/cef/issues/2507
+    'name': 'browser_child_frame_2507',
   }
 ]
diff --git a/patch/patches/browser_child_frame_2507.patch b/patch/patches/browser_child_frame_2507.patch
new file mode 100644
index 000000000..5683de6ec
--- /dev/null
+++ b/patch/patches/browser_child_frame_2507.patch
@@ -0,0 +1,20 @@
+diff --git content/browser/renderer_host/render_widget_host_view_child_frame.cc content/browser/renderer_host/render_widget_host_view_child_frame.cc
+index 08e68296f2a6..0bcc696cf0cc 100644
+--- content/browser/renderer_host/render_widget_host_view_child_frame.cc
++++ content/browser/renderer_host/render_widget_host_view_child_frame.cc
+@@ -623,6 +623,7 @@ void RenderWidgetHostViewChildFrame::SubmitCompositorFrame(
+                "RenderWidgetHostViewChildFrame::OnSwapCompositorFrame");
+   support_->SubmitCompositorFrame(local_surface_id, std::move(frame),
+                                   std::move(hit_test_region_list));
++  ProcessFrameSwappedCallbacks();
+ }
+ 
+ void RenderWidgetHostViewChildFrame::OnDidNotProduceFrame(
+@@ -914,7 +915,6 @@ void RenderWidgetHostViewChildFrame::OnFirstSurfaceActivation(
+   last_activated_surface_info_ = surface_info;
+   has_frame_ = true;
+   FirstSurfaceActivation(surface_info);
+-  ProcessFrameSwappedCallbacks();
+ }
+ 
+ void RenderWidgetHostViewChildFrame::OnFrameTokenChanged(uint32_t frame_token) {