Update PDF accessibility when zoom level changes

pdf/out_of_process_instance.cc

Index: pdf/out_of_process_instance.cc
diff --git a/pdf/out_of_process_instance.cc b/pdf/out_of_process_instance.cc
index f26f18b02abf5794142973705d43e0252b1db559..92511185c9715dd610adc6353cae440616666284 100644
--- a/pdf/out_of_process_instance.cc
+++ b/pdf/out_of_process_instance.cc
@@ -626,12 +626,7 @@ void OutOfProcessInstance::LoadAccessibility() {
     return;
   }
 
-  PP_PrivateAccessibilityViewportInfo viewport_info;
-  viewport_info.scroll.x = 0;
-  viewport_info.scroll.y = -top_toolbar_height_ * device_scale_;
-  viewport_info.offset = available_area_.point();
-  viewport_info.zoom = zoom_ * device_scale_;
-  pp::PDF::SetAccessibilityViewportInfo(GetPluginInstance(), &viewport_info);
+  SendAccessibilityViewportInfo();
 
   // Schedule loading the first page.
   pp::CompletionCallback callback = timer_factory_.NewCallback(
@@ -701,6 +696,15 @@ void OutOfProcessInstance::SendNextAccessibilityPage(int32_t page_index) {
                                               callback, page_index + 1);
 }
 
+void OutOfProcessInstance::SendAccessibilityViewportInfo() {
+  PP_PrivateAccessibilityViewportInfo viewport_info;
+  viewport_info.scroll.x = 0;
+  viewport_info.scroll.y = -top_toolbar_height_ * device_scale_;
+  viewport_info.offset = available_area_.point();
+  viewport_info.zoom = zoom_ * device_scale_;
+  pp::PDF::SetAccessibilityViewportInfo(GetPluginInstance(), &viewport_info);
+}
+
 pp::Var OutOfProcessInstance::GetLinkAtPosition(
     const pp::Point& point) {
   pp::Point offset_point(point);
@@ -1418,6 +1422,9 @@ void OutOfProcessInstance::OnGeometryChanged(double old_zoom,
   if (document_size_.IsEmpty())
     return;
   paint_manager_.InvalidateRect(pp::Rect(pp::Point(), plugin_size_));
+
+  if (accessibility_state_ == ACCESSIBILITY_STATE_LOADED)
+    SendAccessibilityViewportInfo();
 }
 
 void OutOfProcessInstance::LoadUrl(const std::string& url) {